Incorrect Billing and poor customer service

My account was wrongfully billed, I contacted Telkom several time and youre put on hold for more than an hour after being finally being answered by a consultant the line just drops. I send emails regarding this but still no resolution or contact.

That is very bad, I actually want to reverse the full debit order if this is not resolved. very very very bad especially now when we are all financial constrained due to covid pay cuts.