Booker Wholesale complaint: Discrimination

On the 16th May 2020. I was in Birkenhead bookers roughly around 11 to 12 am. I had no issues while I was loading my trolley with what I intend to purchase. I had no issue from any customers or staff during that time. I was shopping with my mum. We went to the till to pay for our goods. We were then told that we cant have 2 split transactions. Only 1 transaction per trolley. Which I still don’t understand why we can’t. The gentlemen was very polite to explain to me the reason as there are other customers outside patiently waiting to go into to the store to purchase. At that moment I was not very impress with how your staff handle the situation. There where no sign by the entry door indicating 1 trolley 1 transaction. Your staff explained to me this policy is to save time for customers waiting outside. In my point of you this did not help to escalate customers. I had to load what is my products so they can scan my mums product first so her cost of product would be on the top of the transaction bill for us to calculate. It was not a small amount of product we were purchasing it was for a business. Instead of time consuming we spent more time unloading. If you had a notice before we enter I would have used another trolley. Due to this problem I had to work out the itemised billing at the car park and notice your staff charged my bill with £12 toilet tissue which we did not purchase. I went back into the site straight to customer service, which your staff at the customer service desk told me to go and line up outside where there was 6 potential customers waiting to go in during this heat wave. In my point of view. I felt discriminated because I’m Chinese. Before I went into the site requesting for my money back that I was scammed by your staff I made it loud and clear to the potential customers that I am not pushing the que. I have been unfairly treated with the staff and all I want is the £12 refund for a item I did not purchase. Instead of being fairly treated your staff at the customer desk did not let me explained and requested me to go back outside and line up. In my point of view that is a disgrace because you have scammed me on my bill. He said out loud and clear in front of customers and staff for me to exit the building because I would not line up. In my point of view, there was no sign at the entrance 1 transaction per trolley and queuing up in a heat wave, wasting my time because your staff billed me for something I did not purchase is a disgrace. I was not happy with the service not informing customers 1 trolley per transaction and no aplogogy for taking my money and ask me to leave the building. Eventually they resolve the problem and found out it was the staff who charged us the bill. I exit the building as he said but I did not get an apology for the mistake your staff made and humiliated me on site. I would hope you would carefully invest in your cctv camera during that event. In my point of view I was extremely miss treated and no aoplogy after your staff knew the problem. In my view I felt I rascism treatment because I am Chinese and this covid19 has caused your staff miss treatment for Asian people.
I would appreciate if you look into the cctv and rectify this problem with your staff.