FNB Block account. As a FNB client we feel they did not look after us as there client

We lodge a complained about 10 days ago, and was told that this matter will be solved within 48 hours. Nobody contacted us yet. Our account was blocked by a 3rd party that we did no business with. We were on line with the bank for 2 hours today and nobody could help us. They keep on transferring us from 1 person to another person. It is now more that 10 days. We are a essential services business and is busy losing work and need our business account restored.