Telkom Fibre

I signed up for R499 telkom fibre package by Telkom back in August 2022. It was "ok" for some time up until they issued me an invoice outside the amount (R550) I signed up for. I visited their branch to query the sudden increase and I was told that the Store Manager was not available to assist me. The store assistants then directed me to call headquarters instead of calling the headquarters on my behalf to resolve my query. I decided to pay that amount (R550). As if this was not adequate, in June I was issued/slapped with another invoice for a further increase of R750. I feel that Telkom is trying to **** me. Every time I try to call their headquarters to cancel they send me from pilar to post.