room rent deposit return problem

The bank that you opened the blocked account with?

If your deposit was put into a joint blocked account with a bank, it can only be released with both signatures and, when it is released, you will also get any interest that the money has earned.
Is there any reason for the owners to refuse to release the money? Was there a problem with the inspection when the contract was terminated?
Of course, if the deposit was NOT put into a joint blocked account then you have got problems!