One customer owes us $5000 dollars for jobs we did for him. My partner did not get documentation on the jobs on this customer because he knew him for a long time . My partner said that he always pays and he was the one that gave him credit to this customer ( let him pay later). Its been over a year and the customer hasn't paid. Half of the money belongs to me. The customer has a business of his own and he keeps telling my partner that he will pay but up to today he hasn't.
What can I do to get my money (half of the $5000 dollars)? Sue the customer? Sue my partner ? or sue both?