Poor behavior of my bank staff - not recommended

I have been very dissatisfied recently with my bank’s operations. I am a customer of United Overseas Bank UOB here in Singapore. I have been dissatisfied lately because of the poor behavior of the bank staff. I have opened a checking account and have been using that for the last 3 years. Never have I ever encountered such a stupid mistake to be done by my bank! I had to transact my account as I had to pay one of my customers, and my cheque somehow bounced, and I waited three days for this issue to resolve, and kept calling the bank’s customer service but did not receive a firm response from them and they just kept delaying. I visited the branch and had to waste my time repeating what had happened, they said this had happened due to some maintenance issues and that my problem would resolved soon. But it did not. Ultimately, I had to speak with the managers before I could get my issue resolved. Would never use the services from this bank ever again!