ADR MP Fernand Kartheiser submitted a parliamentary question asking for further details from Minister of the Economy Franz Fayot.
The LSAP minister confirmed that 512 customers received invoices which were intended for different recipients.
586 other people did not receive an invoice in December at all.
The company explained there had been a computer management error which resulted in the billing issue. The correct invoices have now been issued to the concerned customers, who also received letters of apology from the POST.
