I have a free subscription, so i have limited access to 4o and can only send x messages before it stops the conversation, thats okay, cause i dont need 4o, but i cant use 3.5, it doesnt let me choose that i can ask the question and then it will automatically respond in 4o and i can then regenerate it into 3.5 but it still stops at the limit, i should have full access to 3.5 which the sub says i have

 

If you are on the free plan, then you simply get whatever they give you. There is no promise or guarantee of any particular model or service level.