MANAGER swearing at me

As a former employee of CTM. I am utterly disgusted that a manager can speak to customers the way he did to me. Last week I returned two taps which one of them where already credited on my invoice. The warehouse manager William assisted me and the attitude i got from him was like i stole the tap being an x employee. The situation was sorted out with the manager the following day. Today I called the store and spoke to Gerrit as i needed to buy a bag of grout but would be there at about 5:10. He said it was fine and assisted me. When William saw me in the store he verbally attacked me. Saying i must **** off out of his store. I did mention to him I'm no longer an employee and he can not speak to me in this tone. He said it's after 5 and he doesn't care. All of this infront of the manager and salesman that was completing cash up. I eventually losted it with him and swore at him as i was not going to get disrespected like. I'll never recommed anyone to shop at this branch.