Are bank service providers making Proffit out of monies kept on suspense account?

Wish to share my frustration due to standard bank, it's been a Month and a half since money was deposited into our business account that was later closed due to lack/scarcity of work for our company. Usually with other banking service providers money that has been deposited to a closed account would be paid back to the sender within 3 days, but with standard bank that's not the case. We have been running around trying to access the money but till today we have not been assisted by the Bank, putting us I more jeopardy.

Be careful who you choose to bank with.