Cartrack bad service

After being a client of car track for almost 2 years I seem to have a major problem, I had financial issues and skipped some of my payments but at the end of last year all my payments were paid up to date. My debit order would always go off either the 28th or the 1st of which I didn't mind, now all of a sudden the debit order go off on the 15th of which I never changed, I know it's my responsibility to make sure there is money in the account but I don't work for government who gets paid the 15th I can show you on my bank statement how many times car track has debited my account.

I never completed a form for the debit order date to be changed or received a letter from car track, and why would I want to let my debits go off on the 15th if I get paid the 28th.

I want to cancel my contract with cartrack they are one of the baddest companies you can get I will never refer anyone to them to sign up for a contract.