Sales closer for safety “work boot” sales deals

I need some help with phone marketing. I have a customer that I can’t quite get over the line. Need a new voice to convince buyer. Am selling a product called King Stone Safety work boots. I need to know what is the block to the sale. Need to be delicate but tenacious. Should be a short job. $10 per transaction up to 100 sales. Be considerate that the buyer is Indian time zone. Will send contact details on job award.