BILLING ERROR

DISSATIFIED UNHAPPY CUSTOMER. I have a ADSL uncapped 5mbps wi-fi with Telkom paying R329 however from May i have been receiving invoice for 10mbps that I didn't ask for and my speed also didn't change. I call then called Telkom and advise them of this high incorrect bill, ref ***A I was promised it will be sorted out. I don't know how many times I called Telkom and non of those calls helped resolving my complain. I've been billed an incorrect amount from May up until now. the service I've been receiving is pathetic and *********. I want this attended urgently and I want my refund