Cover Cancelled

Firstly, my one premium for the month of Feb was returned. I then received an email on the 28 of Feb stating that if I want to keep my valuable cover then a debit will be put through on the 4th of Feb - (incorrect date provided). Then i was advised that my cover has been cancelled, (due to one payment not being received, you have cancelled my cover). Is this even legal? I have been paying my premiums from 2011 and now without consideration, you want to cancel my cover. Today, I received a call from a consultant who asked me numerous questions to reinstate my membership and then advised my son that this case has gone back to UW. UW have advised that they have cancelled my cover and only offering accidental cover as I have not advised them that I take meds for Diabetes. (Again this was also disclosed, pse refer to the offer letter). I think that honestly, 1life is a company who *****s innocent peoples money and I am going to report this to all the Newspapers, 3rd Degree and the Ombudsman. I am sorry, I will not accept any ******** as I could have chosen any other company to take up life cover with, but i deceided to go with you, as i felt that you were a good company.