Don't take car insurance with them

Hi

Please help, My husband recently took a car using Auto & General insurance problem is now he is no longer interest in their services, We have cancelled the insurance with them , They call him everyday threatening him to blacklist him if he tells them that He is no longer interested in their services, Please advice is this appropriate ? I mean no one can force you to take the insurance that you no longer want. I am so disgusted with them they debit our account every time we must always run to the bank to reverse a debit order because You cannot have 2 insurances in 1 car, We ain't crazy. His number is ********** , His name is Mr Sibulele Mantshantsha,

Please help me with this,

Thanks

Pelokazi