First National Bank is not operating for customers

Good day, I have contacted FNB today 3 times to decrease my overdraft. I have tried decreasing my overdraft to no avail. The process online is not rocket sciennce and is easy to decrease but the system upon updating the overdraft keeps giving me an error message. From about 9.00am they still have not called me back. I understand the Covid constraints but not to even send you a message is sad. I cannot go in to the bank as I have a health constraint. I have been with FNB for over 30 years and their customer service just seems to get worse.