Telkom Billing Incompetence

Telkom sent me an SMS on 5 June 2018 advising me that I can switch over to fibre at the same cost as my DSL service. I have been experiencing endless billing issues since fibre was installed. I've made numerous calls to the call centre with no resolution. The issue is that the DSL service and line rental has not been deactivated and billing is running concurrently with fibre service. My monthly bill comes to R1586.74 which I've being paying on the understanding that that my invoice will be corrected and the necessary credits passed. My monthly bill should be R807. It seems IT Back Office and Billing department has no clue what they're doing. Very poor service indeed!