I enrolled in their 'free' trials for 7 days because my stupid company wanted us to take the 'writing emails in English professionally' and already canceled right after I finished the course, which is in 2 days. I even saw an advertisement of 50% discount if I was to continue anyway. But still a month later I was charged 49$ for the 'monthly fee' to which I'm 100% sure that I've already canceled.
I tried to go to their Help center and as you know, they weren't really helpful and it only got more frustrating as they say that any subscription made after the free trials is 'non-refundable'. I was stressed out so I don't really remember how many links I had to click to get to the chat box, in which I typed in my problem and asked for my refund. I was sent an email from their help desk, which even had a name and seemed the most likely to be a real person. In the email this person said that they've already issued a refund for my case and that my refund will be returned in the original form of payment in 3-5 days depending on my bank.
Just to make sure, I logged in to my Coursera account on laptop and try to cancel any 'subscription' that is still active, I found none. So I just deleted my credit card to stop them from ever charging me again. I'm still waiting for my refund tho.