Being charge for services that is free

I Derick Muller have a home adsl system with telkom. I have moved from Mahikeng north-west to Kroonstad Free state and asked for the fixed line to be moved to Kroonstad and installed at the new address. 1st i waited almost a moth for installation to take place there after I waited for a credit note for the period off time after witch it got resolved. Now i received a invoice off R1728.94 stating i bought some device i don't even have knowledge off and when i phoned it was said that it was for installation. When I moved i asked if installation was free they said yes and that it is included to my contract!!! My line was suspended due the fact that there was amounts on it witch I had no knowledge off and I refuse to pay for that. Can some one please assist me with this matter???? And the fact that the amount is only due by end of August and line was suspended on the 15/08/2018 is unacceptable!!! I want this issue resolved ASAP!!!