How can i cancel payment pending orders?

Hi there, How can i cancel 2 payment pending orders for BF1? I ask this as when i went to order it, the origin store said twice that "an error occoured" . after retrying i gave up and used just a card number and not paypal. The card one worked, but there is now 2 payment pending orders for bf1 on paypal. Is there any way i can cancel these before they go through? Live chat has been useless (sat in for atleast 20 mins with a wait time of 5 mins but no reply), so im asking is there anyway to cancel the orders 100514405757 and 100514365757? I really dont want to be charged £150 when i oly intended to spend £50.