MTN data upgrade frustration

An MTN rewards/loyalty consultant phoned me in December to offer me an upgrade on my data contract. To my surprise the upgrade is now a separate contract which means I now have 2 data contracts which I will be paying for which is not what I signed up for. I phoned MTN to cancel and I am being sent from department to another with no assistance, what's frustrating is that I now will be billed for 2 contracts now which I cannot afford and did not agree to.