Old Company Following A Lot And Harassing Me Mentally

I resigned from my previous company "A" and joined a competitive organization "B". My previous organization "A" raised a non-compete clause that I signed with them and forced me to terminate my employment with my new company. I terminated that employment immediately considering legal clause and joined a company "C" which is totally non-compete. Now, after a month my same old company "A" is again chasing me asking which new company I joined now. I really don't want to give them a name as I don't trust them. I am sure that my new company is not a competitive of the old one. I explained this to them but they are still following up asking for name (which I don't want to give because I dont trust them) and also they are not willing to give any list of competitive companies from their side which I cannot join. No cooperation from them. This is giving me lot of mental pressure and I feel like getting harassed from them.