Cancellation on the contract

I have called RMCS last year October I was asking them to cancel the contract and the person who helped me said to me it will be cancelled. Then I went out of country when I come back on the 10 January 2018 my cell number didn't work. Then I called RMCS they told me that their technical team will contact me to fix my number then cancel my contract, they didn't contacted me till I go back to work of which is out of country and now I cannot receive calls from South Africa on that number ********** 233. Please fix my number so that I can roam it with MTN then cancel this contract as I have indicated before.