Electricity purchase via cellphone banking *****

I used my cellphone banking app in APRIL 2020 did a purchase of R1000 electricity got 780.6 klw did another June 2020 purchase of R1500 and got 760.9 where is my R500 worth of electricity FNB

This is a *******!!!!!!

FNB :-) FNB Ref: XHQXDWMG. Municipality ***/***.

Please refund me for my full transaction, I would rather purchase tokens from reliable retailers