[bob33212]

I would find an attorney that is willing to send a letter that states:

"Thank you for your correspondence, I regret to inform you that you are mistaken in your understanding of my software. The methods of data transfer and QR code analysis are in no way covered by your patent. Even if my software was infringing on this patent, I think that your patent should be invalidated by prior art. Please see Patents, X,Y,Z as evidence of that." It doesn't matter what X,Y and Z are, you are just making them waste time on technical work.

Basically you are saying. Lets go to court and let a judge look at all these detailed technical things and let the Judge decide if I owe anything or if you should have this patent at all.