Complaint added time frame to sort out claim

So I was told that claims process takes 14 days however it's going on 2 months,I was sent a consent letter this month,I filled it in,somehow I had to reconfirm I'd sent all the details,when I called this week they said my claim has been chosen randomly to go auditors and it takes 21 days to be processed.On top of the delays they keep making,they now saying I have to wait a further 21 working days.No stick to agreed timeframes these tactics are frustrating and a quick way for us to go to other companies