Application details not found.please retry with valid Sticker number.

I app**** for my ZEP on the 3rd October. On the 14th November online tracking said it had been returned to VFS 13 November. Phoned in to find out if I could go and collect, was advised it would change status to ready for collection. Checked online tracking on the 15th Nov it showed "Application details not found.please retry with valid Sticker number." to this day. I have sent emails with all screenshots and receipt and phoned the Call centre and was advised it would be corrected. Still today no action has been done. Very frustrating as you would expect that by now I would have collected. Hope someone from VFS will be able to assist.