No stop or stand violation. Was not given or mailed a physical ticket. Location written is incorrect.

I work at 10 St. James Ave, Boston. I have worked there for 3 years. Outside the door it does not say anything about no stop or standing. Down the block is 30 St. James Ave, where there is a no stop or standing sign. I never got the physical ticket nor did I get a mailed ticket prior to now receiving a notice identifying the ticket number, violation and the 21 day penalty amounting to 100 dollars from the 75. How would I appeal to this? If I was stopped/standing, wouldn't the enforcement agent have time to give me the ticket? Yes, there could be the assumption that I drove off, but then again I was not in the said area of violation where there has the no stop/standing rule.