Wrong telephone number upgraded

My Huawei media pad cell number and router cell number were both due for an upgrade. I requested that they only upgrade the router number as I am intending to cancel media pad number at the end of the contract. I chose to upgrade the router number because the amount a pay for the router is higher than the amount I pay for the media pad. They instead upgrade the media pad number. I phoned Telkom but they have referred me to Sell direct as I upgraded over the phone through sell direct. I have been phoning sell direct none-stop and the telephone number is not picked up by anybody. I am very frustrated and upset because this means I will be paying lots of amount for this. I really need this resolved as soon as possible. I find it very strange as well that Telkom is also unwilling to assist me whilst I am their customer.