Tired of Repetitive responses and no help

On 14 October I was de*****ed on my bank account. I immediately phoned Standard Bank and reported it and my account was blocked. They told me I needed to obtain an affidavit from the police and I told them I was a pensioner and had no means of getting to a police station. I have just followed up with Standard Bank, as it's a substantial amount of money, and the response is, we need an affidavit. Aaaarrrggghh. HELP. What I keep on forgetting to ask is why did Standard Bank authorize R21 000 to be taken out, when my authorization was for R42.00 at the time!