Hi there-
Was the legal protection added after the quote was given (i.e. if the quote they gave you was £400 and that is what you have paid with the £30 included in the quote, or have they added the sum on top of the quote?)
The reason I ask this is that youcould do another quote for insurance and compare quotes- some of them may still be cheaper than KwikFit and you could contac thtem again and ask for a price match on your policy.
Maybe you can cancel under a 'cool off' period. If you threaten to do this, they may be more willing to help you.
It will depend how you generated your quote- online or over the phone etc. It is optional to take out; although I personally always have it as it protect you against uninsured drivers, accidents etc. Its peace of mind really but then as I said, you could have got a cheaper quote elsewhere for the same thing.
Legal protection has helped me a lot in the past as I always seem to get people driving into me(!) and they put you through to a solicitor, help with hire car company etc.
At the end of the day though, if you dont want it they should listen to you.