Fedex incompetence

I'm expecting a parcel from overseas. I made a cash deposit with the reference number given to me on the invoice on 6th December. No details were supp**** on the invoice as to where to send proof of payment. I was called by the consultant, Justine Billings, and was asked where my payment was. I said i had made the payment in cash direct to their bank account with the reference number given to me. She said this is not adequate as proof of payment had to be sent to them? I said I was unable as it was a cash payment and their admin department could easily verify it with the reference number I used when making the cash deposit. She said she would get back to me. She didn't, and has now apparently gone on holiday. Nobody has contacted me, and I'm still waiting for my parcel, two weeks after having paid them. Their call centre is useless, and nobody has phoned me re the parcel, which I have now paid a lot of money for. It's despicable!