Fast Deals Today — unauthorised charges on my account

I subscribed to Netflix for US$9.99 (Approx. MGA 37, 030) on a promotional plan on February 19, 2020. Upon checking my bank account debits, I found out that Fast Deals Today debited me US$14.99 (Approx. MGA 55, 420) on the same day. I had no knowledge that this amount would be charged to my account and I find it unacceptable. I would like a refund for the US$14.99 that has been taken without my knowledge or permission from my account. I will be expecting a response imminently with a refund and explain as to why I was charged.