TeamViewer's unreasonable cancellation policy

I'm very unhappy with TeamViewer. I purchased one year TeamViewer subscription a year ago and didn't read the fine print on the invoice. They also didn't make me aware of the fine print.

My subscription came up for renewal, but since I didn't read the fine print a year ago, I didn't know that my subscription will be automatically renewed and the payment collected without prior consent or warning.

I'm not using TeamViewer anymore and I contacted them the moment I received a notification from the bank that a payment was made to TeamViewer. Their response time on my query was slow and, they refused to refund me.

Although it is mentioned on my sale invoice that you need to inform them in writing 28 days prior to the termination date, I think they are very unreasonable to not: 1. Send a reminder to cancel your subscription if you don't want to continue with the subscription; 2. To let you pay for a year's subscription although you explained to them that you don't use it anymore and actually forgot about the subscription; 3. Deduct money from your bank account without prior warning.

They are inflexible and do not act in good faith. Looking at the industry standard as per Google Playstore, subscriptions can be reversed if you don't use the app anymore.