Disappointed and frustrated that my contract has not been cancelled— as promised

I was offered a portable MTN WiFi router deal back in October, and accepted. The router was delivered and I found that the router was not portable as I was promised. I called and emailed, requesting that my contract be cancelled and that I return the router. I successfully returned the router. However, the contract was not cancelled (meaning that I am now paying for something that I am not using). I called and sent more emails, and was promised that the cancellation request would be escalated. Now money has been taken from my account, messing with my credit score. I am sincerely disappointed with Mondo and Rewardsco and their service.