Hi I'm Clive I had a problem with Telkom

Hello my problem is that I had a Internet modem from Telkom the line was cut for about 8months i pay the outstanding balance while the line was still of I had report it they only come on the 10 of October to come and fix the line now they send me a invoice for a bill of R1722.35 how can I pay for service i never received they say the was active and i told them the line was active on the system but at the pole it was not active I ask them to ask they IT people to check all they say is I must pay the amount please I hope you guys can help me thank you. My name is Clive Arendse my account number is ********** 545647