no written confirmation for cancellation

I was due to have a face to face assessment today. originally the date was set for ten days previously but as I had a doctor's letter requesting a home visit, I phoned the Benefits Office and they gave me another appopintment which was today whilst the letter " got through the system which could take ten days". Nine days ago because I had not heard anything, I phoned Birmingham, and they said the paperwok had been faxed through to the Assessment Centre that day and I should ring in another week if I had not heard anything. So, a week later (two days before the assessment due date) I phoned again and was told that the appointment had been cancelled. I had not received written confirmation so was unsure. Phoned the next day, and there was no record of my conversation, but was told yet again that the appointment was cancelled, and she checked with her colleague to affirm. I was told that I would be contacted the next day (day of appointment) I wasn't, and neither have I received written confirmation. I did not attend the appointment. What happens in this situation? Was I supposed to have gone? It is 20 miles away and am reliant on pther peopIe. have been in the WSG for many years, which was awarded via tribunal. Anyone else had this happen?