Aggresive and rude

After having to go back to get her New tablet to work my Aunt of 72 eventually asked Me(Jacques) to help. She previously sent the tab in for repair.After getting it back was told to get a dual sim to get it to work. (I'm not sure how this translates with her 1Gig package, or if she would be charged standard out of bundle rates!!) ? She payed for new sim & still there was nothing working on her sim( No H or 3G reflected next to her signal icon). I went with her into store and asked whether they had activated sim as I could not call out on the Tab. Lady said sim was not activated. I also asked why dual sim had been recommended? Was told she could not see why. I asked to return original method of seperate sim. She said it would be no charge but later said her manager had declined this and we had to pay I asked to speak to him . He said they had to charge. I mentioned previous sim had not been activated so they could not charge . One would cancel the other, and besides we had been back 3 times. He kept saying we had to pay. As I tried to explin he kept cutting me off. I raised my voice, he then got aggresive and responded, obviously ****ing me off. All will be on cameras 15h45 19/8