Feeling betrayed by my car insurance company Dialdirect!

This is becoming ridiculous, I cancelled a car insurance in 2018 as we sold the car . I sent numerous cancellation e-mails to Dialdirect with no reply at all. I even got information that they will come back to me within one day. Still nothing happened! Dialdirect is still charging the insurance fees on a monthly basis. I am forced now to implement legal procedures. This is not what you need from your insurance. Be warned before doing any business with them. I would simply call it ***** !!