Virgin Atlantic poor customer service

I have been struggling to make a payment on a booking which I personally made. I had to hold for 2 hours at a time every time I have had to make a call. My mom, son and I traveling to the UK over December. I need to make a payment on the shortfall of my mom's return ticket. Despite me being responsible for the booking as well as being the only person making the payments, I spoke to a useless call centre agent who was unable or rather unwilling to simply take down my card details to complete the payment.