PIP assessment cancelled last minute

Hi I’m new here and wondering if Capita cancelling recorded PIP assessments the days before is commonplace? My original appointment was an u recorded one but I changed it to a recorded one following advice and so that there is more assistance of the assessment being conducted fairly. I have been waiting since June 4th for my assessment. It is now 24th November. My recorded one was due tomorrow at 11.15 and my wife had taken the day off work and alternative childcare arranged. Approx 10am this morning Capita rung me to say my assessor was sick and my appointment could only be kept if I opted instead for an unrecorded one. I politely declined and the lady I spoke with who was pleasant at this point said ok and she would ring me back before 5pm to let me know if the sick member of staff would be back to complete my recorded assessment as planned. At 3.30pm I received a call to say unfortunately she was not contactable and again offered me an unrecorded assessment at the same time. I declined and said no problem
i will wait another week or month or whatever and it needed to be a recorded assessment. The lady then became rude and said”well I can’t rebook you one and I’m
off tomorrow so I’ll get a colleague to ring you tomorrow. I have mental health issues abs this has done me no good at all. I feel pressured and wondered if this was standard practice? I am now very anxious someone either won’t ring me tomorrow to reschedule or someone will ring to pressure me into an unrecorded assessment.  Surely they should have confirmed with the sick staff member first before ringing me this morning and rung me offering me a new recorded assessment. Disability groups have long campaigned for recorded assessments but I feel like the DWP are trying to get round this. I would be interested if anyone else has had any similar experiences. I had built myself up to crisis point in worry and now I feel terribly let down.