Refund abd cancelation

I canceled my policy with old mutual abd they asked that I write a letter attaching my ID copy which i did.. Than they sent email acknowledging and confirming cancelation. Only for them to take premium after 3 weeks of cancelation.. I sent email asking them to refund my money as policy is canceled they than rep**** telling me they will only stop premiums after 3 months unless i tell payroll to cancle them. How when they are the ones still taking from payroll even when canceled. Than someone from old mutual signed me up for another policy when i ask them to look into it they telling me to go to the brunch