Good morning

I'm looking for a bit of help or advice if ok.
Just a bit of background first:
I've been on Universal credit since February this year but was previously claiming child tax credis (married 3 kids)
I was diagnosed with Fibromyalgia and CFS back in January 2016 (after a long battle ?) since changing over to universal credit I've been providing them with fit notes since. I was due to attend a Work Capability Assessment back in May but I wasn't very well so I had to cancel it. Upon calling I was told I needed to reschedule and leave a message on my Journal explaining why I couldn't attend. I then received a reply saying they recieved my fit note they haf requested and that I didn't need to rebook .
??♀️
Moving on to this week - I've had an appointment for a Work Capability Assessment ??♀️ I've been told I should have completed a UC50 prior to my appointment? I've never recieved one or filled one out.
I called the assessment centre who've told me that I need to call Universal credit themselves.
I've left 2 messages on my Journal. I'm currently on hold waiting to speak to someone as I write this...
Any help would be great.
Thanks so much