THE WORST ONLINE BOOKING COMPANY IN THE WORLD. WHY CAN THESE EVENT PEOPLE NOT GO BACK TO COMPUTICKET AND OTHER BOOKING CHANNELS

ITs a pity you dont have a minus star, this is the worst online ticket platform I have ever used. I purchased tickets for Sting on 10 October, the payment went through my credit card. On 12 email I received an email from Ticketmaster staging Thanks for your order "You're IN" and received confirmation with ticket numbers I could not download the tickets and sent many email requests to Ticketmaster. You can only send them an online message they do not have telephonic human contact. On 30 October I received a reply on one of me emails advising there was a technical issue , I must rebook and that a refund has been initiated. To date no refund. I have been trying for 10 days to rebook tickets all to no avail. Lots of further emails they advised I must clear my browser etc which has been done, they then advise there must be a trouble with my bank, contacted my bank, no problem who also advised they have not received my refund. Can someone advise how to proceed with this company