Resignatiom Withdrawal payment

All my documents were completed and sent, my previous employer paid my last contribution. I received an email from them in October stating the progress of my claim & no further feedback was received. I contacted them on the 17th of October & I was informed that payment will be submitted on the 24th of October. I give them a call to ask how far it is & when I will receive my withdrawal funds, they informed me that there was a system error & payment could not be made, I was told my claim is under assessment, which has been that way since the 17th of October. They let me know on the 25th of October that payment will be made today on the 28th, I call them & guess what?! Still under assessment & It was confirmed telephonically that payment will be processed today. I have spoken to various agents & each time I get a different story. I am extremely frustrated & unhappy with the service.