Worried

Hi I'm new on here so please be patient ....I'm concerned about a friend who pays yearly for Norton protection, Unknown to myself she had a virus so Google a telephone number for Norton she rang and got thru to guru aid, they seemed to be good on the phone logged into her computer,saw the virus , well to cut a long story short they wanted to sell her 3 years protection but she only took a 1 year one £152 . Took 2 hours to sort her problem out but since then her pic has slowed up and freezes now and then . my concern as I'm PCs brain dead are these people genuine why if she pays Norton yearly did she have to pay to have a problem sorted . Hope there's someone out there that understands wht I'm on about . :-) ty