No service - To cancell contract

No Service! I reported to Netstar the cancellation of one vehicle on my current contract [vehicle was sold] on 25th March 2020. I received a reply from Netstar with my outstanding balance on this contract, On 23rd May I sent an email to Netstar, requesting a history statement, with a copy of the contract signed by me] and instructions to them, that they should NOT debit my account 2nd May 2020 as I would settle the balance by EFT AFTER evaluating their statement. I then received an email [in which I was CC'd] from Netstar reading 'Good day, .... please assist .... Kylie Senekal'. As from 25th March 2020, NO communication from Netstar even after numerous emails sent. Needless to say, Netstar did debit my account for April 2020 [although I gave notice of 30 days, which I accepted[, And they debited this again in May 2020 {after I explicitly told them NOT to do so!]. I will, therefore, cancell my complete contract with Netstar for the additional two vehicles on same contract. R Roodbol ***