Had a about 7 chase letters & it's gone quiet now!

Hi just wondering if anyone can give me some advice I got a ticket at the promenade car park perranporth. I parked there as the seiners hotel where I was staying was packed due to a wedding. I left it there over night & had a ticket from AS parking for £100 if paid immediately £60 daylight robber, what cowboys I have been informed by a family member who had a similar experience this ticket is an invoice it's NOT a fine as it's not issued by police or council. I have been told to just ignore it make no acknowledge of it or respond & eventually they give up. Has anyone else had a similar experience please???? I really do not want to give these idiots my hard earned cash!!!

Hello I've just received a notice & intend to ignore it as it's private not council owned property how did you're situation work out for you?