Even though they've passed it on to another collection agency? are they even allowed to do that?

in may 2016 I went primary with my friend and her baby. I was carrying her baby around the store and she was shoving items she wanted in the buggy. I PAID for a pair of shoes I wanted and she had everything she wanted so we went to leave but security stopped us and took us into the back room. they didn't find anything on me but took a scan of my drivers license and my number. They didn't call the police, didn't offer my friend a chance to pay for the items and got all items back. I have received numerous letters and 1 phone call from RLP about a fine to pay. It had been months since I heard from them and then today received a call from CCL (County Collections LTD) about the same incident. What can I do? and whats going to happen now?