I also have similar experience with CIMB atm machine. Try to withdraw RM100 from affin bank account using MEPS but the machine state got transaction error and only give me the recipt.

The next day I check the RM100 was gone from the account. I go to affin bank and ask me the transaction recipt from the atm, luckily I keep the recipt.

and it takes 2 weeks to bank in back the RM100 >.<