Buying electricity on fnb prepaid app

I bought prepaid electricity on the FNB app as usual. Bought two in a row. Second one for increased usage during lockdown. The first one went through. The second one didn't. Tried numerous times. When I called them, the consultant said there's nothing wrong with the voucher and that I must contact the municipality.So you take money from me and the rest is my problem? I bought the voucher on your platform? So dissapointed as I have never had issues with FNB. Now I will think twice before buying electricity again