Bad service from call center agent

I called RCS call center this morning at 10am and I spoke to Hashel. I wanted to know which pick n pays uses the RCS card around East London he couldn't assist me and said I was shouting him and threatened to drop the call. All I wanted to know was which shops are using the card because not all of them do, I asked him to help me and look in the system but he refused. And it was not the first time calling the call center and the lady I spoke to for the first time was able to assist me because I wanted similar information about Spar but the guy I spoke to today couldn't help and told me he's not allowed to check that on the system.