Lincoln Financial is taking months to provide me with my benefit checks. I'm unsure where to go from here.

I am currently going from STD to LTD, i have had nothing but problem after problem with Lincoln. Much like most on here i have jumped through hoops sending in my own medical records( which saves them money) only to hear they are waiting on doctors notes or they sent the request to the wrong #. I have not gotten a payment in a month, this coming after waiting a month an a half for a check from them. I am 51 and diagnosed with sever Osteoporosis with active multiple thoracic vertebral compression fractures. I am unable to to return to work as i can not stand or sit for more than 15-20 minutes at a time, which my job requires me to stand all day along with lifting and bending / stooping which i can not do. I am not sure were to go from here as they have not denied my claim as of yet. We have used up all of our savings to “keep a float” thus far. I have been fighting since the end of August of 2017 to get paid from these people and i don’t understand how they can justify what they are putting people through. Lincoln is offered through my employer at no cost to the employee. Any help would be greatly appreciated.