Debit Query

I bought a car and called mfc that they have service plan they told me to call them after 2nd service it reached 180k km I canceled

But continued to debit me which I canceled but I cancelled

And I bought a at a fixed rate but continue to increase my repayment with rate changes

They increased my repayments R1260. 46

My details is Id number *** Mfc account ***

I have a sign copy of agreement In place