Policy cancellation letter & Premium refund

I requested my funeral cover to be canceled and sent a letter in April but didn't receive any correspondence because apparently they didn't receive my email which was funny because my mom used the very same email address and received correspondence quicker. I eventually was able to cancel it in May but I didn't receive any formal letter informing me of that but i was just notified telephonically. The premiums are still going off my paysheet which I understand it might take 2 months before it can be removed on the paysheet but according to my understanding and experience with other brokers, when the plan is canceled and it's a stop order, any premium that goes off after the cancellation is returned via the bank. So I don't know with this poor correspondence where should I send my banking details for my refund and also the paysheet as proof. Please get back to me urgently via email and pay my premium back. Your premiums are even expensive.