Adult assessment waiting times

My 27 year old son has so far waited 4years and 6 months for an autism assessment with no signs of getting it anytime soon. We live in west sussex just wondered if its really usual to have to wait this long. I've tried to contact them several times but they will not discuss waiting times. I've also been in touch with PALS who do look into it but we just get a generic reply saying they can't discuss waiting times. I'm at a loss as to what to do. He has severe social anxiety so can't work and won't leave the house. I feel like I've let him down . Any advice? I'd be really greatful.

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