Fed up client

Car tracker has not fixed my problem they sent me an email that I owe then a prorata cancellation of R110.00 because my cancellation will be effective on 13.03.2023 I told them that I made a payment of R240.79 on the 2nd of March they must take their money from that amount and refund me the difference. All of the sudden the lady I was communicating with through emails did not respond.

Early this morning I received a statement that I am now owing R130. 50 after taking that R250.79 how possible is that . I am tired of this nonsense with car track please fix your nonsense before I take this to consumer right because I have proof of emails. You say we are valued customers is this how you treat valued customers?