my infinityfree account wont upgrade after paid

i want to upgrade dentcmu.epizy.com to premium hosting 3.99USD (iFastNet Super True premium web hosting.)
i already paid but my account wont upgrade

Ifastnet invoice
Invoice #WFWEF-550617

The account is not on InfinityFree. It is on iFastNet. Check their website, not this one.