Missing/****** items

i had a delivery and a return scheduled for the same day. the delivery came the morning and when they collected the afternoon, my son accidentally gave the delivery that came the morning. when i got home and realized the mistake, i called the driver but he said the parcel was already handed in, then i called superbalist and spoke to Insaf, she then successfully cancelled the original return on the system (i am still sitting with it). to date i have been phoning and emailing, but i keep getting the same responses from Miska, Ashley and Gary, warehouse is still trying to locate it, how is this possible because i gave them the return waybill number, i asked for a supervisors number but this cannot be given to me.