unhappy with service

Disability claim being handled badly and taking too long to be finalised. They really delaying to finalise the claim and is blaming the delay on my employer, theyve received the medical report and when I send through my claim forms I also attached a copy of my employer form that was completed by my employer confirming that im being booked off work. What really upsets me is when thhey were deducting my premiums every month the didnot as for confirmation from my employer about my salary and there were no thousands of questions nor forms to complete but now that they must honour a claim ive been paying premiums on they giving a person the run around and im sick and cant concentrate on getting better be caused I'm under loads of stress regarding