Stalling and not wanting to approve disability

Has anyone had the unfortunate experience of having to put in a disability claim at Consolidated Retirement Fund? I've been with my GI specialist for 4yrs, we've tried all treatment available to me for severe Crohn's Disease and i was deemed totally and permanently disabled by my specialist as my disease is not responding to treatment. What bothers me, is CRF asked for a report from my specialist to approve my claim. I gave them the report in January, in Feb they asked for another report and my specialist stated my condition, treatment and prognosis won't ever change since i'm on optimal treatment and not responding. Sanlam accepted this exact report and deemed me totally and permanently disabled. CRF on the other hand, is now asking me to wait even longer (till June) and then get ANOTHER report from specialist (the 3rd one) which will just be stating the same as the specialist already stated there WON'T be ANY change. Is this a stalling tactic? Or do they just want to waste my, and my specialist's time? Are they hoping I give up and just forget about my disability benefit? Meanwhile my medical bills are mounting up, and all these report requests cost money as well.. What am I suppose to do now??