My Fujitsu siemans wirless button not working?

I contacted BT because i was having a problems with internet connection. They went online with me and shared my computer. They went through wirless settings and basically tried to sort the problem out. when they reset my computer and asked me to set my wireless on via FN + F1...i then found out it aint working when it was perfectly working 5 mins be4.. they have tried to blame my computer an are not taking the blame,,, i think its strange how they asked had i warrently straight after i said it dont work..as any1 any ideas what i can do