Telkom is useless!!!!

Telkom changed their roaming partners from Mtn to Vodacom, eversince this happened, I am unable to use my internet at all, I logged a complaint at the call Centre and nobody responded to me, I called in again and they said I must wait 48hours for someone to call me and they never did, but I bet when the bill is due they gonna want their money. How can I pay for something that doesn't work???