I get no message at all

it just doesnt work

I sent a mail on this sometime back with no reply.

Profile search works fine. Please send via email or private messaging your search criteria or/and make sure they are not extremely narrow

I try to write a message back to reply to someone and it says my inbox is full. I only have 25 received messages and about 35 sent. my limit is saying i have 200 and i'm nowhere near that.
Message pops up to say i'm over the limit and to upgrade to get limitless inbox.