Well, okay but...if you have so much work than you are putting in 14+ hours, 7 days per week and still not gaining ground then it's time to start saying NO to new work. Or NO to current work and give some projects back. If you're too busy to even COMMUNICATE with a valued customer then you're doing it wrong.

I'm in the trucking business and we decline loads every day....from our existing customers, even! I'd rather say "No, not at this time" and keep a good customer just that. If we accepted loads that we couldn't cover and failed them, guess what would happen? Right. Good customer, now mad and gone customer.