The Shock of being scammed and how I survived

It happened very suddenly. I had taken out a Tesco Home insurance but we decided not to renew as we found a cheaper offer. So we didn't need Tesco's any more. I had paid in full for the Tesco insurance. Tesco were very insistent, claiming they were still owed money. We sent them correspondence confirming we had paid in full. It didn't make any difference. I was then persistently followed up by a debt recovery agency called Moorcroft, which I later found out are based in Manchester. They were very very persistent, and kept on sending letters even though all the relevant correspondence had been sent in. I began to feel hounded. Suddenly I was shocked to receive an email demand for full payment of an insurance I had already paid. My bank blocked the payment, then suddenly I received a phone call then another one from someone else. One was 'the boss' and the other from his assistant. They were both from the FCA. I had only vaguely heard of the FCA. I didn't know what they did. I googled. What was the FCA? This stood for the Financial Conduct Authority. I was very bewildered. What the hell was going on? They explained that the FCA was very concerned about a series of scams going on and were there to help me. The worst scare of all was that suddenly they had access to my phone and could see on screen all my bank account details. I have three banks and they somehow knew my bank transactions almost before I did. I was shocked and horrified. What was happening? The 'Boss' suggested the best thing I could do was to withdraw money from all my accounts up to my limit. Their explanation was that if my money was in cash then it wouldn't be available for robbery. This kind of made sense. So I did. I withdrew a total of £800. Doing all this took a long time. about 13 hours. I was exhausted. By this time I was getting very suspicious. What if the 'FCA' were really the scammers? So I began to play along with them. My suspicions were confirmed when 'the boss' asked me to wait by my door and a taxi would appear and collect my money for 'safe keeping' . A taxi duely turned up, and I double locked my door. So my cash stayed safe. I went to my local bank to check what was going on. My account was safe. Only the transactions I could confirm had left my account. The scammers had claimed that they had prevented a £500 payment from being made. No such payment had been made. A couple of weeks on, I still feel shocked. I have had a narrow escape. The feelings of shock, of feeling stupid, of being a victim, are still there, but gradually diminishing.