Wrong number upgrade

My Huawei media pad cell number and wifi router number were both due for an upgrade. A sales person from Sell direct phoned me and I request that they upgrade my wifi router number only. This because I am planning to cancel the Huawei media pad contract at the end of the term in April. They have instead upgrade the Huawei media pad contract. I phoned Telkom on Saturday and was informed they cannot assist me. They gave me a number to phone on Monday (10213), of which I did. They told me they cannot assist me, I must sought out the matter with Sell direct as I upgraded through them. I have been trying to phone Sell Direct since 09:00 but there is no one picking up the call. This is really frustrating and upsetting me because if I cannot get hold of anyone to assist me it means the matter will not be resolved. My one big concern is that now I am going to pay lots of money for both contracts. Bearing in mind that the Huawei media pad was way cheaper than the router.