There is an easy way to get these people to stop calling.

According to the BUSINESS PRACTICES AND CONSUMER PROTECTION ACT;

(4) A collector must not continue to communicate with a debtor
(a) except in writing, if the debtor
(i) has notified the collector to communicate in writing only, and
(ii) has provided a mailing address at which the debtor may be contacted,

see this link: http://www.bclaws.ca/EPLibraries/bclaws_new/document/ID/freeside/04002_09

Simply the collections agency a fax at 604.530.4977 stating you wish to be contacted by written correspondence ONLY and state the mailing address at which they can send mail to you. Provide your full name, and be sure to clearly note what matter pertains to (i.e. parking ticket for license plate number ABC 123) the sign the fax, and record the date you sent it. Keep the fax. You also need to send the same fax to the creditor (i.e. the parking lot company).

If they are calling you about a parking ticket from Diamond Parking, in the same fax, tell them you wish to dispute the ticket and all related charges in court. They wont take you to court because it's your word against there's, they won't win. Even if they tried the cost of pursuing the matter in court far exceeds the sum they can hope to recover.

Lastly, a parking ticket and fine from a private parking lot WILL NOT and CAN NOT affect your credit rating. You did not borrow money from them and not pay it back. Parking tickets from the city, however, might be a different story.

I found this piece of information regarding Wiggins Adjustments Ltd - Wiggins Collection Agency on their website. It kind of gives us a glimpse into what they're doing.

Wiggins Adjustments Ltd.
HEADQUARTERED IN LANGLEY, BC, since 1952, Wiggins Adjustments Limited has successfully collected delinquent accounts for the Province of BC, its municipalities and crown corporations throughout its existence.

Originally founded in 1929, Wiggins Adjustments Ltd. has operated continuously in Canada for seventy-five years. The company is presently managed by the second generation of the family that has controlled the company since 1952.

Through the '70's and '80's, Wiggins' management undertook an aggressive program of expansion throughout Canada. The company opened offices in Winnipeg, Saskatoon, Calgary, Edmonton, Kelowna and Vancouver.

By the end of the '80's, it was no longer necessary to maintain records in unique offices, when a master computer-based database, controlled and updated online and in real time, was available. Accordingly, in the '90's, the company consolidated and reorganized to take advantage of these developments in communication and database management technologies.

Today, Wiggins' traces and contacts debtors across Canada and around the world from the company's main offices in Langley, BC.

Looking forward, Wiggins Adjustments Limited will continue to leverage its leadership in the adoption of new technologies to better serve its clients. Wiggins has developed one of the collection industry's most respected collector training programs, and will continue to refine its recruiting, training and motivational practices.

The company has also developed proprietary, Windows-based Account Management software targeted specifically at maximizing the efficiency of collectors who must handle high-volumes of small balance accounts.

Building on extensive industry knowledge and experience, the company will continue to pioneer new and faster ways to communicate with and collect from debtors, including web-based interaction (initial contact, ongoing communication and payment processing) and text messaging.