Line Speed Upgrade

This has been my worst customer service experience to date and has left me with a very bitter taste in my mouth, so much so that I actually want to switch to another ISP provider. Two weeks ago I called and placed an order for a 10mb uncapped package. I am currently on a 4mb package. A few days later, we received a call from the technical team to say that the order was successfully processed. After testing the line speeds consecutively over a two day period the speeds did not indicate any increase. I called the call centre several times after that over a 7 day period and was directed from the technical department where a fault was originally logged to the billing and sales call centre. I was told by the technical team that the issue was related to my actual account which did not reflect the upgrade irrespective of the line being upgraded. This afternoon, I spent two hours on the phone to Telkom. I was assisted by someone in the Sales department who apparently said she had rectified the issue. I tested the line speed again after the call and it is still not sorted. I attempted once again to call the technical team but after 37 minutes on the phone, I gave up. Please help me!!!