Disgruntled claimer

It's been 3 months of waiting for Mr Price processing my claim. Twice I sent the relevant paper work because "they lost the paperwork the first time". 2 weeks ago I called them to follow up and the excuse was "there is a backlog but you should get feedback today". The feedback I got was asking me if the Affidavit had the relevant info on it (which if they checked it, they would have seen everything they requested was on the Affidavit). The last 2 weeks I have tried to phone them evryday probably about twice, asked numerous times for a call back but no one followed up. Since when is it the customers duty to follow up on a claim after it's been submitted? Almost 3 months when it was said it should take anything from 14 days to a month??????? My Ref no is LC***5.

I would like feedback asap because I honestly think thisnis ridiculous now.....