I pay for 10mb but only get 5mb

I keep paying for a 10mb line but only receive 5mb-5.2mb per month. I have logged multiple calls for this with the note coming back that I am too far from the exchange, my issue is then why give me the package if they know that I was too far. I asked them what can I do about this and they advised that I can downgrade but will be charged a fee for early cancellation of the contract. <br> <br> I want to be refunded for the last year when Telkom could not deliver.