Ah yes, welcome to the world of Social Services...Meetings without agenda's or goals, no minute-taking or agreed plan or action points, hours and hours of time wasted - yours and theirs - and while you might be losing wages attending these meetings, their hours are clocking up nicely. If I had my way, I'd have a major cull of social workers, and put the money into the actual service that you are meant to be accessing - i.e., practical help - because those hands-on workers are paid a fraction of a social worker's wage and do 200% more for families with disabled children.
You seem to be being offered what social services want to offer you, not what you need. Write down exactly what sort of help your DS and you need to have a good life, (not just to get by). In an ideal world, what would that look like? 5...10...40 hours Direct Payments or an afterschool club or overnight respite? Group activities or just him and a worker? Mainstream activities or specialist? What days, what hours, how will it differ in the holidays? Do your own research if you haven't already about what is out there. Don't wait for social services to tell you what is available as they aren't called gatekeepers for nothing.
Then ask them for what you need - plus a few hours on top - and they will probably say no, but they just might give you a bit more than you currently have. Don't ask, don't get.
Do not tolerate being treated like a PITA - that is a common SS tactic to make you go away. You have to become a velvet steamroller, a persistent, pleasant PITA. They may guilt trip you and say you aren't needy enough, or other families will suffer if you get more help. Tell them that this is not your issue. You need help and you need to keep your family functioning. Cry if you feel like it as this works quite well I'm afraid to say.
It all sounds a bit manipulative, but unfortunately I've seen families go under and many marriages split up and I've even seen children go into full-time care, because help hasn't come at the right time in the right quantity. The financial cost of that is colossal so don't feel embarrassed to ask for what you need to keep going