what do i do

[bigginge]

right as some of u will know i sold my b6 the love of my life due to work change
now i have an issue as i sold the car a month and half ago the guy tbf a out of work chav
has rung me threatening me etc because apparently the clutch is gone.
now im devastated as the car was as near to showroom condition as ever and hes taken it a ruined it (he says hes dented it etc)
and he says hes only covered 1k miles and its my fault hes shagged the clutch and possibly the df.
now im honest n would help but hes threatening me and my fam and constantly ringing me .
now after trying to be nice after like the millionth phone call he said he wants me to pay 900 quid to have it fixed
iv said no and left it at that as to me hes trying to con me (no proof of dodgy clutch)
and when i had it, it was fine (im a mechanic and it was under full wear and tear warrenty)
where do i stand.