Unresolved Bill issue and bridge of agreement

I have a problem with telkom mobile, they are ****** and treat their customers like gabbage. i had an LTE contract with them and i have been using is without a problem for quiet a while now without issues. I have been paying them R100 for the contract and now that their contract is almost at the end they charged me R300 and they telling me that i have requested extra data for 500MB of which i have no idea wht they are talking about . When i call them, for assistance they send me from pillar to post and i am not getting any joy out of this. Seconly on the 1st of August 2018 I received a call from Telkom the employee by the name of Grant offered me an upgrade on the LTE and for some reason they have not delivered as promised and i dont want an upgrade anymore. The call centre lady tells me that she has escalated the matter and that i have to wait for the partner company that sold me the upgrade to contact me and nothing is happening. which does not make sense because Telkom debit my bank account but they refer me to some partner for my query. I am very disappointed with them and don't want to do business with them anymore.