Bought wrong airtime

I bought airtime this morning of R80 from my standard bank account on mobile app. Instead of selecting mtn airtime i wrongly chose cell c airtime and correctly punched in my mtn number. I have called my bank to inform them and they have advised me to contact cell c and mtn, cell c is becoming difficulty, the guysI spoke to don't even listen to my problem. I just them to transfer the money to my cell number then, but i have hit from pole to the rock from cell c guys.