Questão jurídica principal
Whether the VAT surcharge on connection fees lacked a sufficient legal basis or breached good faith/right to be heard.
Decisão extraída
The challenge was inadmissible to the extent it relied on a new legal-basis argument; no violation of hearing rights or good faith was shown.
Fundamentação extraída
The appellants had only argued good faith before the cantonal court, not the legality principle. The record showed the fee schedules were understood without VAT, and the prior connection permits already indicated this.