Have to pay for something under guarantee

I Bought a Ryobi Battery Operated Blower/Vac, used it 3 times and had to take it in to supplier because the adjustable switch kept shocking me and does not work on the variable adjustments. Then I get a call that I have to pay and extra amount for an item and that is not covered under 2 year guarantee, this is the worst service received and I have always been a Ryobi customer. I have checked the T&C in the booklet and no where does it state switches is excluded from the guarantee.