Proof of Purchase Required

I purchased a handset (cash/prepaid) on 5th May 2023 from Vodacom Online Store and have been trying ever since to obtain an invoice for my purchase. I have called 082 135, ***, ***, ***4 and spoken to various consultants. I lost count after 10. Nobody seems to understand that I made a purchase and now require an invoice or proof of purchase. Everyone is very eager to palm me off to another extension and I've been chasing my tail. Please, PLEASE can anyone assist in sending me an invoice or proof of purchase for my device? One consultant asked if I can't contact the courier company for the documentation???