I don't believe thats the case. I think a trespassing notice has to be served to be legal. Simply telling someone next time they drop in is not a legal trespass notification because it cannot be proven. It has to be documented that the person knew he/she was on notice in order to be enforced. It is a legal procedure. You can only simply ask someone to leave otherwise. Not arrest them for trespassing. I seriously doubt, in this case, that the store filed for a notice. Unless, it still remains to be served. Since the OP went in the next day, it may not have had time to be served. So it is wise for him to check and see if something is in the works. If it is, he should then take action to end all ties with this company on the grounds that they have refused to provide all services by keeping him from the store.The OP would not have to be "served" any (paper) trespass notice for it to be effective. The next time he went to the store he was notified that he was trespassed and asked to leave. That's the actual trespass notice.