MTN unwillingness to help correct their problems.

Quiet disappointed. I used the MTN app to purchase airtime. I received the transaction approval mail from MTN and the funds went off my bank account. The airtime was never loaded. I went to a MTN shop and they couldn't help me, so I contacted MTN customer care. After countless mails proving to them that the fund went off my account, I was told to contact the my bank because it's my banks problem not theirs. I am now being ignored by MTN. This is what you get for being a loyal customer of many years who has never been late on a payment.