Just took my $28.99!

I have been using this program for 3 years (at least). I have renewed my Premium plan each year. My renewal expired the other day, so being a good little customer I clicked on the link to renew which brought me to my apple account. After 3 tried it said payment successful. So I went back to my Todoist and tried using some of the features. It stated that I need to renew my premium membership. I checked my credit card and I was billed for the Premium service.
I have had other issues throughout the years with their servers going down at really bad times during my projects.
I love the interface, and I love the way the program works when it works, but this is supposed to be a Productivity App. I’m not IT and I shouldn’t have to deal with this. Now who do I go to for my refund? I suspect I will have to challege it with my Credit Card company.

filmwrk about Todoist: To-Do List & Calendar, v6.3.18