Totalsport online payment problem

I logged in on Totalsport online on the 22nd of November 2018 to purchase a Garmin Fenix 5 Silver/Granite Blue band. When trying to pay for the product there was a technical issue on the website. I received order confirmation via e-mail (p ********** 16) and have 48 hours to do the payment. I tried 3 more times to do the payment on before calling the Totalsport call centre. When calling the call centre they advised that because of black Friday the system is overloaded and I must try doing the payment later. I then tried again 4 times and still the payment did not go through. I even changed to a different bank card and tried a few more times and still the payment was unsuccessful. I then again phoned the call centre and they said that it's not on there side and I must contact my bank. I did that and the bank advised all is in order on there side. I again phoned Totalsport call centre and said all is in order from the bank but the payment still does not want to go through.The Lady advised that the error might occur as the item is sold out. I ordered this product when there was stock and I received order confirmation. I have tried to make payments from the 22nd until the 24th and no one can assist me with they online payment. I only have a few hours left to complete the payment before my 48 hours are over and then I loose the deal.

This is unacceptable.