I bought a bag off a seller through ebay, item number ************ i put my items in it...

I bought a bag off a seller through ebay, item number ************ i put my items in it used it after *nd day put the straps on to use it as a ruck sake and the straps broke, when i looked the stitching came undone at the top, so i used it as a shoulder bag while walking that strap broke too, so i contacted the seller and he asked me to remove my negative comment and he will give me **% refund i said no I'm in titled by law to a full refund as the purchase is faulty. I sent him photos and told him i would sent the bag back which i done on **.**.****. I've received an email to say that I've been sent a refund to original payment method well I've check my bank account no refund is in there, as i didn't pay for this purchase through pay pal it wouldn't go back to that account i have check to make sure and there nothing in there either. So I'm still waiting for my £**.** refund please.