I am disgusted at the behaviour of Asda's staff:

After a complaint, we were banned from the store. The security manager and checkout assistant were both rude and bullying. When complaining at head office, we received an ill-spelled letter from the local store in which the bullying security manager told us he himself had made an investigation and found himself right. How ridiculous is this?

I have two concerns now: Firstly, how come the security manager can investigate in an incident in which he was involved and make a decision as a judge as well as participant? Secondly, how can Asda headquarters delegate the matter to the local shop when we have asked for their help? The letter also stated that we are banned from the shop.
As it is our local Asda, we went back to shop yesterday only to be threatened with a call to the Police!
What kind of customer care is this? I am appalled at Asda which I have always considered as the top one of the big 4. Asda has bullying and insulting stuff and sticks up for them. We are disgusted!