Bad service

Friday night when I tried to buy airtime I saw my account was locked. Saturday morning I visit the bank and they phoned ***** department. I spoke with a lady that would not tell me why my account was locked, just that an investigation is ongoing. What do they investigate, they never spoke to me or ask for documents. She said they will phone within 24 hours to discuss the case, it now 48 hours and ***** is open 24/7. I think its pathetic that they dont let the customer know about locked account and do not tell them what is going on. Looks like Standard bank just lock account for anything, no reason and investigate what? Talk with the customer