Nightmare taking a new policy out!

I took out a new policy at the start of July. I was informed of different timescales online and the subsequent email for submitting NCD proof and copies of all drivers driving licences. I followed their instructions and emailed all of the required documents. I subsequently received letters saying they had not received the documents. I immediately uploaded all of the documents on their online system which all worked well. Two weeks after that I received further letters saying I had not provided the required information. I telephoned them and was told that they had only received 2 of the 4 documents that I had emailed and uploaded (despite sending all 4 documents at the same time, each time). I therefore emailed the documents several times (again) whilst speaking to an advisor and she confirmed receipt of one of the emails whilst I was on the phone (this time I had to email the documents separately). I thought the other email would arrive shortly after. I was told not to worry as I had until the end of August for the documentation to be received. Today, I received a cancellation notice, giving me 7 days notice of cancellation - as I had not returned ANY of the required documents. This completely contradicts (again) what I was told yesterday! I really do despair. I have never dealt with such an incompetent company and never had a problem taking out a car insurance policy before. I'm not sure if the incompetence lays with their systems and processes,their staff or a mixture of all.
Their incompetence has taken up far too much of my time (this is the shortened version). I read similar reviews and gave this company the benefit of my doubt. Bad mistake! Additionally, at the very start of taking this policy out, they sent me documents with one of the named drivers as the main policy holder. This was their mistake and yet, I had to pay to get this changed on the documentation! As soon as I can change my policy (after a year), I will do.
One call management really need to review their new policy systems and processes urgently. Low policy prices alone are not enough to keep customers!