From Contract Cancellation to Deceptive Actions

I canceled my contract with Cartrack, and just a day after that, they sold my contact details to telemarketers. Now, I receive spam calls about 10 times a day. Fortunately, I only provided my phone number to them, so I am certain it's them who did it.

To make matters worse, they are attempting to submit debit orders to my bank account with varying large amounts, but luckily I no longer use that bank account. This behavior is *****ulent and completely outside the scope of our agreement. I feel like these guys are ****mers or something. Why are they resorting to actions that were never a part of our agreement? If there are other options available, my advice to everyone is to consider those alternatives instead.