Extremely unhappy

I've sent in my cancelations for my funeral plan and life cover but was told via sms that it cannot be done as the signature is not the same. I signed on that signature app with your sales rep so it cannot be my fault that you find it that way. What irritates me is that you're quick to sign people up but come up with all sorts of tactics when we want to cancel. So please sort this out because I want it canceled with immediate effect. These premiums better not go off my account the end of January 2024 please