We maintain a small commercial account that is a part of a chain (not a restaurant) and we're still waiting on payment for work done back in the beginning of last month. I was told that payment would be less than net 30 and it's already approaching 60 days. Should I or can I tack on late payment fees on my next bill? Make phone calls? Talk to the store manager? Stop services? Anybody got advice? I know 30 to 60 days is standard for most comms. but when I was told 3 to 4 weeks max. it gets frustrating. Thanks in advance for any help.