Font licensing violation, what's possible options for getting compensation?

Xiaoyuan

Hello typedrawers,

I'm new here, and today I just discovered my typeface commonSans is used by big stationary shop without any license purchased... [ here ]I have sent them an email and comment on instagram in a very respectful and friendly way, but they have been deleting my comments. So I'm here to ask what's your experience, tips in order to get financial compensations on this kind of things? 

Thank you anyways!