Not straight forward Car finance gone wrong !! Help

Bosshugo111

Hi guys

My very first post on here so go easy on me!!
Got a car on finance about 6/7 yrs ago
For just under £28,000
Paid £21,000 off it n fell into difficulties and couldn't pay monthly repayments and the last £7000 (there abouts) off
Told the finance company we couldn't afford it they said return the car which we did. They told me car would be sold at auction and any short fall we works have to pay. Fair enough considering we owed around £7000 (can tell you exact figure if I dig paper wrk out) and the car was worth just under double what we owed but as it was financed we couldn't sell private or trade!! Finance people said basically I wouldn't hear from them again if no short fall....

Well in short 4 years after car he gone and NO letters from finance you'd think it was all good!! Until I received a court letter Inbetween Xmas and new year (Xmas just gone) saying I had so many so many days to reply but letter was dated 2 wks prior to me receiving it and then Court was closed for festive period so I've ended up wi a ccj

They are trying to claim just under £14,000 from me in interest on the £7000 I owed !!!

Can someone tell me what I do as I owed them around the £7000 mark when I returned the car but they've sold car and not knocked any money off what I owed ??? As they've listed the 7000 plus !!!! loads of interest !!!! How do I find out how much the car sold for?? Cos if the car sold for so £5000 it means I only owe £2000
Why have they never contacted me and all of a sudden landed this on me after 4yrs???? I thought if was all done with!! I'm gutted cos no way can I pay off £14,000 !!!!!!!

Please help .....

Ps I can't afford to pay for legal advice are there any free debt solicitors ???