Refund denied for a cancelled plan

I subscribed for a plan with Showmax to view on TV, immediately after payment trying to view on TV the plan, the subscription indicsted it can be viewed on mobile. So I cancelled same day which the cancellation was processed, and asked for a refund. Later within days I called asking about the refund I was informed it takes about some few days which when counting at the time the days had not yet been reached so I waited. Today when I am calling Aas I have not seen the refund thorugh to my bank account, I am informed that since the cancellation the payment method has been removed and the refund is not valid. When I asked about the refund and was told to wait for some days, why was I not informed that the payment method is removed and refund cannot be made so I can update the details, and when payment method was removed, I was not informed. How will Showmax allocate my funds to a canceled plan which they can see it was not even viewed. I am told the refund is invalid and there is nothing they can do. What Showmax is doing is unfair to deny refund for a plan they can see it was cancelled same time and has not been viewed.