Cancel your Premium Free Trail Plan very early if you don't plan on using it

I got the trail for the Premuim account on LinkedIn under the impression that I will be reminded to cancel the subscription if it doesn't work for me before the paying date. Unfortunately I got a rude awakening when I saw my money being deducted from my account for the Premium account. I then canceled the plan immediately because I did not see the value of keeping it, I barely used it in the free trail. My refund was approved for a full refund within 10 business days. The 10 business days have now passed and I haven't received ANYTHING. I filed a complaint around the 7 business days mark and I've just been told to hang tight and be patient but my patience has run thin as i still haven't received my money back after 10 business days. Do yourself a favour and cancel that plans weeks in advance if you see that it's not working for you otherwise you will struggle to get your refund.