When payment is due they respond quicker than the flash

When payment is due they respond quicker than the flash. But I've paid for the phone and the fair price as well and was informed I gad paid extra. I went and informed them of the situation and the said they'd sort it out for me they've escalated the matter and my refund should clock within the next 48 hours from then, we're now going into the 4th week with no refund and what looks like no intentions of assistance from them, each time I contact they ask for 48 hours. Terrible terrible service honestly. They take people on a roller coaster and hope you give up before you get your money back.