Pathetic service

I am very disappointed in MTN during the lockdown. I am not getting hold of them at all and they are suppose to be working from home. Firstly i was debited the wrong amount which meant that i didnt have enough money in my account then the debit order never when through yet i tried my best to get hold of them wanting badly to pay it so i sent an email asking how i should pay and whether i should wait for them to debit again. The only information i got was that the amount that was returned unpaid was R634. Nothing else so i asked how i should pay and why its still that much cause thats the amount if my sisters cellphone contract amount is with but we did a contract transfer so why is it still being deducted from my account. I then waited to a response and i got nothing so i decided to pay it into their account this morning. An amount of R640. Only for them to deduct a R358 again this evening. Still no response on any of their platforms? Are they on holiday? If so why isnt the debit orders on holiday aswell?