Over charged when changing to fibre through telkom. Unable to reply through there app and website

I have had telkom has my internet service provider for a few years with ADSL. Few months back I was contacted by Telkom sales to move over to fibre with Telkom. They said would cancel my ADSL subscription account and change it for the fibre subscription and give me a free router for the fibre. I said that is fine as long as dont get charged for both. They said no wont happen. SUPRISE SUPRISE my 1st invoice which should have been around R700-R800 I was billed for R2400 odd. So I was charged R999 for the free router and billed for ADSL and fibre. Even though the router arrived about 2 or 3 months after promised. Got another invoice again for the same ADSL AND fibre. So I havent even had fibre for a month but now have 2 invoices for it and total of R4040 where my bill should at most be R1500. I have sent messages through telkom app and have not recieved a reply as usual or call as promised. Such a joke. I wont pay my bill until it is right. TELKOM has now disconnected my internet anyway. If not sent correct billing in few days and connected. Will give router back and cancel subscription there are so many other providers out there. Account number ********** 99