Pathetic service and after service

My Father has a wifi contact with Telkom for years now, but since last year after been forced to upgrade and not everything been explained to him properly him been 74 years old. Now that his monthly bills are coming and it was not the amount discussed, we trying to get this sorted out everytime we go into a branch it is told to us to phone the call centre, we be trying to get hold on the call centee for days now with no luck. We sent email with no reply from telkom. His contact had to be R399 and the bill is now R647, and this is for a pensioner. I'll like some one to give me a call on this matter. ***. So we can sort this out