I had a similar experience. I was on AS Aspire and as a result of my disability was hospitalised at short notice. I contacted them to tell them and got a really sharp response telling me that it was my "final warning" (this was the first time I'd ever not attended) and that I must give 48 hours notice in future (I had given in excess of 48 hours notice but when I was hospitalised on the Monday, I knew I wouldn't be able to attend on the Friday). It was a really awful experience.I had such a horrible experience with Aspiring Solicitors last year. A timetable change meant that I couldn't attend one of their events I had signed up to. I sent them an email a week or two before the actual event and got SUCH an abusive reply. That just completely put me off ever doing anything with them again.
HOWEVER, I've also had my life completely changed by them as an organisation. Chris White is one of the most unbelievable human beings I have ever met and works tirelessly to support people in every possible way. Gemma Baker (who now works for Willkie's Grad Rec) completely changed my entire perspective on applications, law firms and life in general. My mentor at firms, the countless people who've checked applications, run mock interviews, attended sessions and give up their free time have honestly enabled me to access a world I never thought I could be an "insider" in.
I have more respect for Aspiring Solicitors than perhaps any other organisation I've ever interacted with - and if I win the Euromillions tonight then they should expect a hefty donation tomorrow morning.