Not getting paid even with the Lien on file

we have PI case that was just settled on monday. Their client owe us about $3700 and her attorney emailed us saying even after litigation there still an't enough money to pay everybody including us.
we do have a lien on file for this case and he now is asking discounts and said he can only pay us $1000 and even that $ is coming out of his pocket.
should our medical office sue the patient ?
Don't this attorney absolutely have to think about paying us for the lien amount before he settle the case?