also how do they get your address it my GFs house my name has no connection with it what so ever but yet they traced me to this address , the only thing i can think of is when i was unemployed last year and had to use this address for 3 month . do the job centre give out your person details to debt collection agencies ?

i got a fee for some reason forget why at nationwide building society , i refused to pay on the day due to being upset about it . i did not pay it in the end i moved house this , that and the other and forgot about it tbh no excuse but there you go . its been about 3/4 years now ,i just recieved a demand for £335 from a debt collection agency . where did this figure come from , what can i do about this , sould i just pay ?