Telkom No Help

I had a Smartbroadband Data Contract for a few years with Telkom. In June I upgraded to the 20GB Data Contract. I have not seen any change on my contract with regards to the upgrade. I was billed the same amount in July as what I was billed for my 10GB contract, but instead of my wifi switching off when I've used up my data, it has continued, so I thought that it is just not reflecting my new contract, but my new contract is in place. Now I've been billed over R500 (my new contract is R459) and I've received messages stating that I'm using out-of-bundle data? I have been trying to talk to an agent and I have mailed Telkom, but so far, nothing is happening and no one is helping me. I have not received any statements for probably over a year, so I can't see my status or register for online service in order to see what is happening. I am very unhappy with this service. I upgraded telephonically and the agent said she would send my new contract details. I'm still waiting.