essential retail services pacific heating and air They do not pay,do not provide reason. Roseville California

We are a refrigeration service contractor.we recieved a call from essential services requesting service on a freezer at a gas station mini mart.Caller says freezer is down,need service immediately.We respond accordingly and are on site within 2 hrs.We find the freezer operating properly but the lights do not work.We report this to essential and they ask if we can address the lighting issue.We diagnose the problem supply an estimate to repair.We recieve a P.O. and proceed to order parts and complete the repair.The invoice was promptly e-mailed back to essential.We recieve a reply with a sign off sheet explaining their requirements and the 12 percent"Marketing allowance"Any and all requirements they may have should certainly be supplied prior to any service.It has been 10 months now and multiple times we have resent the invoice as they claim not to have a copy.Each time it is sent we recieve a confirmation of reciept.We have invested moneys for materials labor etc.and reieved nothing but a run around.I do believe what goes around comes around and shame on these folks.