Contract blunder from telkom

I took out my wifi contract August 2019 which should only 2021 August. I was contacted by an agent in November that Fibre will be in my area soon and they will change the remaining year I have left to fibre. But as I expl2to the agent no line have been laid in my area. She said that fine they will contact me again. On December 1 my contract was called by a telkom agent by the name Ntabeseng Mosisidi. I am currently working from home and need my wifi. I then called telkom and they reactivated my wifi. January 2021 I received a bill of 755. The contract I took out was for 459 for 140 gigs. Now only receiving 50 gigs at 755. I have called continuously since Sunday the 31 January. I have spoken to numerous people but no help was given. Today I received my bill for end of February still billing the 755 even though I received a sms stating my query was resolved and I will be credited with 356.00 and my case number ***4. I called again today and apparently a supervisor will contact me. It's 1 pm I called at 9 this morning. Horrible service from telkom