"Have I Been Scammed?"

Please I'm really sorry this post is going to be a bit long.

I went to a supermarket today to get stuff. I bought stuff worth #1040 and paid using POS. My phone was off as at the time of payment.

When I got home and charged my phone, I immediately saw alerts..
One showing a debit alert of #20,000 and another showing a debit alert of #1,040. Both transactions were done using POS..
I was shocked because I never bought anything worth #20,000...
And the #20,000 credit alert showed that the POS was used in Ikeja, Lagos...but the supermarket I bought things at is in Ibadan.

My question now is, can I get my #20,000 back or have I been permanently scammed?
Or has this ever happened to anybody??

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