Horrible cancellation service

Absolutely unacceptable service! I called 2 months ago to cancel my cell contract giving my ID no. as reference. (When i signed on with the contract, I was given a "free" sim to use which then turned into a payable contract) Upon calling to cancel, I gave through my ID no. which brought up my profile and specifically said that I am cancelling as we are leaving the country. The agent cancelled only 1 no. and left the other one active (which I did not knw about) I called today to query why I am still being billed and have been advised that I did not specify to cancel the other no. Now I have to pay another 2 months worth of bills due to the 30 day notice period to cancel a contract. This is absolute *******!!!!! The current agent tells me that she cannot answer for the previous agent, as to why I was not advised of the other no. being billed, and there is nothing that can be done. I have to pay