Airtime subscription without my consent

Good Day

I have been subscribed for airtime without my consent and now that I am requesting a refund it has been declined. Apparently they have proof that I agreed but this happened before as well and I received a full refund. They are so quick to say they record their calls, I have asked them to listen to that call where this guy repeatedly told me it was a reward and I said I would not pay for it. I have never even used it. The service i received thus far has been disgusting!!!