IAS Repeatedly cancelling/ F2F

Forgive me if I am asking a question that's already been addressed. I have been on DLA for 20 odd years having got a lifetime award for my disability. Last year, the transition to PiPs meant I was I had to complete the questionnaire and was called for a medical. This happened last August. In October< I was contacted to go for a 2nd f2f assessment, no explanation initially given. My advisor contacted them to ask why. I was informed it was an 'audit'. Since then, IAS have made approx 7-8 dates for me to attend, only to cancel at short notice. The most recent f2f was to be at my home this morning between 9-11am. At 8.55 I got a phone call saying they were regrettably unable to do the assessment today and would reschedule (again) for Feb 26; and thanked me for my patience. Honestly, it has become so stressful and is like the sword of Damocles hanging over my head. I feel powerless to do anything and am also having to simultaneously lodge an appeal about my ESA . (Being removed from support group to WRAG) Do we have any rights as claimants to say 'enough is enough?' Throughout this period, I had to reschedule one of the many assessments as my daughter was taken into hospital and I needed to travel to be with her. They referred my claim back to DWP and I had to give 'good reason' and had my DLA suspended temporarily. This is really going too far though now. Thanks in advance for any advice and hello everyone . Best wishes Cat