refusal to cancel policy therefore I must pay premium

I emailed Auto and General on the 30th March 2025 to cancel my policy with them. The policy included my 2 cars, building and household contents. I sold my one car on the 13th March 2025 and I told them and then they wanted proof from the dealership which bought my car. Which i sent through to them, to date I have not been refunded the pro rata for that car and have not received any communication regarding that matter. I then sold my other car and my property in the village, I sent them a cancellation email. My account was then debited and I called Auto & General and spoke to Nathan Chetty who refused to accept the email that I sent on the 30th March and was adamant that I will not be refunded my money. Auto & General have been communicating with me via email and I'm shocked today when they refuse to take and email as a cancellation. I'm a pensioner and do not have funds to call but I made means to get assistance to email them and cancel. I do not possess those items anymore so why must I pay for items that are no longer in my possession? I'm told to go to court to get confirmation that I do not own those assets anymore but we work with tribal authority. Is this how we are treated by Auto & General. I will advice my daughter to also cancel her policy with you as we cannot trust you, if this is how we are treated by you.