Please stop taking my money

I've been with this company for 2 years I was paying the policy without any problems and they decided to increase the amount then i told them I'm no longer be able to pay them I want to quit then recently towards the end of February this year they called me saying they have reduced their rates and I told them I wasn't interested so just because they still got my information they thought it an ideal for them to deduct money from my bank account without my permission