Billed for tokens I did not receive

On 6/28/2017, while attempting to purchase a token I received a message stating that I was unable to purchase token due to an error.  I made another attempt to purchase the token and received same error.  Not sure if the problem was a problem with my computer, I restarted computer and again attempted to purchase the token.  Same result with a new message stating to try again in an hour.  In total, I made 8 attempts to purchase a token being told there was an error.

I was billed $72.00 for a token I never received.  I would like to receive a credit to my account.