I deposited a whopping R210 trying to purchase a monthly voucher and I had forgotten about my extra time debt of +-R13

I deposited a whopping R210 trying to purchase a monthly voucher and I had forgotten about my extra time debt of +-R13. They took everything and gave me a 7 day voucher and my remaining balance was R20 MTN South African is a **** 😭😭😭😭