eHarmony complaint: Auto Renewal Despite Cancelling

I decided that I did not need eHarmony anymore a few months before my renewal was due in September. I followed their instructions on cancelling their auto renewal and completed the process in July. I also think that you should opt-in to auto renewal rather than opt-out…
To my admonishment on my credit card statement they had taken another annual subscription on me costing ~£350.
I immediately emailed them with my complaint and they just dismissed my request for a refund and close my account. I soon replied suggesting that they refund the amount minus the days that I have used since renewal. Again they just dismissed me.
I checked the TC’s and noticed that their refund policy regarding auto renewal was all in block capitals, so that just shows me that they have this complaint on a very regular basis.
I would like them the refund me before I get my credit card company to do it instead.