I purchased LinkedIn premium by mistake, I actually didn't know I purchased it until I saw the statement in my bank account, I asked for a refund (I purchased it by mistake) and Linkedin App only refunds within 48 hours of payment, since the payment is only 1 month after subscription starts, it is impossible to get a refund. I feel it is a bit of an abuse, if you purchased something by mistake. And you notice it when the first bill arrives.