Unsatisfactory complaints resolution

Following months of investigations, Vumatel called me to say that they will not refund as they cannot trace the double debits and / the unauthorized transactions from my standard bank account or card as well as capitec account or card and can only advocate to credit R800 because of the magnitude of this issue, which may or may not be refunded within 2 weeks.

The consultant mentioned it was on a recorded line and I uttered that they refused to accept bank statements as proof of payment, I forwarded the payfast confirmation emails of receipt of payment as they requested yet they are not going to refund any of those monies and are looking to close this matter and conclude it as resolved, beyond the existence of proof and evidence that these unauthorized deductions took place, by saying:"they cannot find them...".

I would like to hear from @*** which steps are necessary to file a lawsuit for essentially *****ulent activity regarding unauthorized transactions and poor service and whether or not it includes their payment system Payfast, contracted by Vumatel, and what the threshold of such *******ities.