Bad service from MTN customer service

I bought a 30 Gig super data pacage through the MTN app with my bank card. I was sent a proof of payment by MTN and after 2 calls they still say they don't see my payment. The last lady screemed at me and whe I asked to be put through to management she transfered me to a department that can't tranfere me back to the manager. They want us to use their app to buy airtime and data and then steel our money by having it disappear and giving the bank the fault.