Slow ADSL line

I had MWEB as ISP the past 7 months at the new address that i am staying at. Never ever have i had speeds above 5mbps. Mweb Sales told me last week that the max speed they could provide would be 4mbps because i am to far away from the exchange. Funny thing is Telkom did a test from inside my house to the exchange and tested and showed me line speeds just over 10mbps, but still they can't provide me with a 10mbps. So they suggested a 4mbps package so i aggreed and they only downgraded the data package and not the line to 4mbps so i am still paying for a 10mbps line as well. So the past 7 months i paid for a service they couldn't actually provide. I am expecting a partial refund for the past 7 months and immediate cancellation of my service with mweb. Please also release the line in the pool so that i can continue with a new service provider.