Telkom Mobi - Terrible service!

Upgraded my Telkom Mobi (LTE) in January 2018, they incorrectly upgraded to 50 GIG instead of 20 GIG package and debited my bank account with double the amount that it was supposed to be. Phoned Telkom on 6 March 2018 and queried the amount debited to my account, no response until now. Phoned them today again, 15 March whereafter they say that they have 72 working hours to resolve a query. (9 days!!!!!) Really!!! On something that they messed up from their side, almost at month end again....cannot wait for their reply or just some action from someone in Telkom!