Furious Client

I received a sms on my phone,2000 has been transferred from my account. I go to the bank,they lodge a query. Query comes back as a withdrawal which the bank stated was never debited from my account. However, my bank statement shows I was debited. Futher a formal complaint was then opened, but I still have not heard any feedback. The bank was quick to take my money,butctakes their time fixing the problem. 2000 is not small change for me as I am a single parents! Im so frustrated!!