Telkom Bills for services not rendered

I app**** for an upgrade at Telkom from a 2mbps line to a 10mbps, my upgrade was declined because Telkom advised that I has an outstanding amount of R675.00 from 2016. I therefore provided Telkom with Proof of payment of the R675 which I made on the 22 July 2016 . This was on the 5th of September 2017. I now receive an invoice for the upgrade which I havent received which shows that the upgrade was effective since August 2017. When I did the upgrade I was advised that Telkom agents will call to arrange an appointment to come and install the 10mbps line which will come with a free router, this will also provide me with an opportunity to cancel my internet services with my current internet service provider MWEB. The line was not upgraded, no router, no internet services from Telkom since I am still using Mweb, but I got billed for the usage of such for August and September. Guess what still no feedback on the R675 proof of payment I forwarded them