I don’t see that happening as I’m pretty sure unless the foreigner bought the house themselves, the utility would be in the landlord’s name.
They’ll give 30% discount now, but you need to pay the bill first and next time they’ll deduct the 30%.
They said this to me but I said “how can you guarantee you’ll give me the discount on the next bill.”
Remember I visited in person. The lady left and said let me find out. When she came back she said how about we adjust your bill now and send you a new bill.
If anyone sees the 30% reduction in the future please post a pic here so we can all receive it.