Technical problems with PIP telephone appointment

I was due to have a telephone PIP review yesterday after my previous appointment was cancelled literally at the last minute. I can’t tell you all the stress this has caused me and worsening of my condition plus additional ones now like IBS and reflux have flared up. So the telephone call came through and the line kept going silent. She tried ringing on my husbands mobile which is on a different network to mine and the same thing happened then our landline and exactly the same thing happened again. At each point we would try to resume the assessment and I was getting more and more stressed and anxious as I just wanted it over with, When the landline had the same fault the health care professional said she would consider reporting it if she went off and tried another number of another person and then get back to me. She came back to me and said that she was able to make this other phone call with no problems so it must be at our end ! Seriously on three different phones including a landline! Eventually I gave up and rang the centre to rebook, by the point I was in tears they said they had no appointments available and I would have to wait for it to go back into the system and get a text. As my husband is a paramedic and I wanted him to support me for the call I had to rearrange the very first appointment I had as he was unable to get the time off. So I’m worried now that they will just allocate an appointment which I will not be able to change because you’re only allowed to rearrange an appointment once according to IAS and then you get penalised. Can anyone advise me please ? I’ve made a complaint via telephone and my husband recorded all the calls. What makes this all worse is I had to go to a tribunal five years ago when I changed over to PIP from DLA and lost my car which is our only vehicle. The whole process took 18 months and I was nearly suicidal by the end of it. I just don’t know if I can face it again. I have M.E./CFS so severely I am housebound most of the time and all of this is so draining on my very limited energy