Very disappointed-cancelling my cover!!!

Very disappointed. I've been with platinum life for over a year. I took out a cancer policy and I've enjoyed being with them until these past 3 months. They always checked up if I wanted to increase my cover the answer was always no not because I wasn't happy but because the economy is not very good right now and for the year that I was with them the consultants always listened and obliged to my wishes, until a few months ago a lady called me saying that I was one of a select few that qualified for a special increase on my cover basically doubling my cover which meant obviously doubling my premiums. I told the lady that I am pregnant and I was planning my wedding I could not afford to increase my cover. She then told me I should just look over the documents and see the new benefits and she would call me back at the end of the month to find out if I would like to take the increase. I never received any new paperwork and she never called me back on my decision BUT at the end of the month DOUBLE my normal premium was debited. This has happened now for 3 months and still nobody has called me. I never consented to an increase in cover and now I have money getting taken without my permission. I told the lady I am pregnant she obviously did not listen and was only concerned with upselling now i am so done with this policy I've lost so much money that could have went toward my babys stuff. Very disappointed. I am closing this policy asap. Don't want anything to do with them, very selfish and inconsiderate.