Telkom bad service and not selling what was promised when upgrading from lte to fibre

For the last two years I have been with telkom lte, and for the occasional resetting of the router I must say it was working well. Then a sales man phoned me and said i see your contract is expiring, do you want to upgrade to fibre for a much lower premium. I of co**** said yes. He said they would handle the transfer and I don’t need to worry for doing anything on my side. I wanted to upgrade a month ago to a faster speed only to find out that I can’t due to my account being behind. I haven’t even been using the lte since the fibre was installed. When looking into it I found they are still billing at the higher premium for lte and now separately for my fibre. I phoned telkom in September to complain being billed two invoices. They have been deducting the large amount, then only the 3rd of oct I finally got a reference number after calling again. I followed up last week to find out what is going on and the guy said he can’t tell me, I have to wait until telkom sends me a sms. How can this take longer than a month to get resolved. Soon I will have a bad cedit rating because some sales man did not do his work. All I wanted to do was upgraded to a faster speed. Please can someone senior assist me at telkom to get this resolved. They mentioned that the call would be recorded when the guy did the sale. I would never pay for lte and fibre it makes no sense. Worst is I get deducted for the lte account but not the fibre, how did telkom even get this right. I need this to be resolved asap. I am not happy and I am missing out on faster internet for the last month. I think I should just cancel my fibre and go to some other service provider. I am also need to be refunded from when I received my fibre line.