It might help if you ask Geo Blue to send you a copy of the Guarantee of Benefits for your appointment via email, they're usually ok with that and send a copy in minutes.
I'm having the same issues with Geo Blue. Claims I filed for services in February are "in progress". BHP insurance department employee said they told her they are "overwhelmed".
I extended my retirement visa last week at Jomtien. I got there about 1:30 pm, took five minutes to obtain a number at the check in counter and saw the immigration officer almost immediately.