****** Money not returned despite several calls

Discovery took money from my account for this month(December), even though I had met all the Vitality Active Rewards Goals for Apple Watch in the month of November. I was then told that there was some confusion about billing and that I'm in fact being billed for October. Since the 9th of September I've missed a grand total of 4 weeks and I was billed for this in October already. But I have now been billed in December again for 4 weeks of missed goals even though I haven't missed any goals in this period. So I have been billed for 8 weeks instead of just 4 weeks. I had called Discovery multiple times regarding this billing and I was promised that the amount for 4 weeks of missed goals will be put back into my account but nothing has happened so far!