Pathetic customer support

I’ve been trying to reach out to resolve an issue of being billed despite making an eft payment. They still haven’t acknowledged or made note of the eft payment and keep billing me. So at the beginning of this month I reversed the debit order because I’ve paid them more and guess what… they just decided to disconnect the service without notice and their excuses don’t justify what they did. So I made another payment in order for them to reconnect, then suddenly they’re willing to address the issue and after the resubmission of the proof of payment they stopped further correspondence. Another month is going to end, I have not been refunded for paying extra and still I’m owing them? Like this makes no sense, no one responds on their communication channels but they’re quick to say that the error is on my side. The customer service is really pathetic and all they want is the money.