No services since Mar 2017

I have had no services from Telkom since Mar2017, due to cable theft in the area. I was advised by Telkom they will not replace the cables. i then was billed for April and May 2017 even though services were not active and i was refunded for 1 month. i then completed the forms to terminate my line and services in May 2017. i am presently getting billed for non existent services after sending in the forms on 4 occasions to various agents in the call centre. i have spoken to more than 5 agents and nothing is done since may2017. i would like my line cancelled and my payments refunded.