MTN indiscriminately double-debits account.

I have had my MTN account since 2005 and recently and on two occasions during lockdown my account has been double debited with an additional R4700 coming off my account. There is NO WAY to speak to an agent and even the store could not help me. This is completely unacceptable! During the crisis the last thing I need is more money being sucked out of my account and receiving 0 service.