Still waiting for you to call me back!

On the 29th of November i tried to make an online payment of my order however my voucher did not work the message the follows

"We seem to be having a technical problem. Please try again, or call customer service"

I then ended up making a payment with my debit card. I tried to use the voucher last week Friday and i was told that the voucher has been used and i told them that it did not work when i tried to make an online purchase.

I then contacted contacted customer service and i was told that complaints department will investigate and call me back up until today no one has contacted me as yet.

This is so exhausting honestly!! my complaints number is CS-513897

This voucher is for this initial complaint CS-459181 and according to the email when i received the voucher it is expiring in 2 days time and i am still waiting for TF'G's call since last week Friday.