No assistance on my query

The service I'm getting from telkom is ****py, I bought a router through Mondo and I was told it would cost me R129 per month however telkom keeps debiting more than agreed. I called them a week ago and spoke to lady called Queen Msani she however tried to push the blame onto Mondo but that didn't work, I have been waiting from the 17th of September for an answer as to why are they debiting more than what is supposed to be debited from account, this morning again I reversed an amount of R1131 that the debited this is also creating unnecessary bank charges onto my account. I am honestly disappointed in the service from telkom.