Cancelled my insurance but Im still being charged

Sylvia came back and offered to reinstate my policy and pay the claim, by which time I had already secured another insurer as I was told by Tukedi that my policy was being cancelled with immediate effect and all my premiums would be refunded to me, I now discover I have paid the new insurer as well as Momentum for June and have not seen my refund! Please advise as Sylvia also promised this will be done asap and not have a negative record!