Sanlam Gap cover some assistance please.

To Sanlam. I sent in a email to cancel my gap cover which was done without hassle. Thank you.

I however also indicated that I was double debited last month for no apparent reason as all my accounts, premiums etc are paid timeously. I asked also for a refund to be made to me, however this was not addressed. Please assist in this regard for a refund of the premium that I was overcharged.