I would just like your opinions with respect to whether or not I was reasonable to e-mail a complaint regarding the incident below.
I was shopping with my adult son at our local large supermarket, in the late afternoon in the middle of the week. We chose items worth just under five pounds, and I paid for these at the self-service checkout, using the contactless app. on my debit card. I declined a receipt and I do not have a banking app. on my phone.
After purchasing the goods, I handed them to my son and went to the loo. When I came out of the loo, I found my son in conversation with the security guard. The guard asked me if the shopping was mine. I said it was. He asked me if I had the receipt. I said I had declined the receipt. He asked my if I had any proof of purchase. I said that I did not have a banking app, but I waited until I heard 'payment confirmed' before I left the checkout. The guard replied that he has reason to believe we were attempting to leave the store without purchasing the goods.
I assured him that I had purchased the goods, and perhaps we could check the till roll at the checkout.
The guard then told us to come to his desk. We followed him. He looked at the CCTV footage and told us that not only did it confirm that we had not paid, but there was footage of me 'doing this hundreds of times'. He said he would call the police unless we paid for the goods, left the store and never returned because we were 'banned'.
I was getting a little upset, so my son suggested we paid for the goods again (even though we knew we had already paid). We did this, then showed the guard the receipt and I asked why he had said he had footage of me stealing 'hundreds of times'. He denied saying this. I asked if we were banned. He said no. I asked for his name and said I would lodge a complaint because he had handled this situation very unprofessionally.
When I got home, I checked my bank account. I had paid twice, so there is no way there would be any footage of me not paying. I have lodged a complaint online with the store.
I am just wondering if perhaps I have overreacted.