ISLAMABAD: The Pakistan Telecommunication Authority (PTA) has warned telecom companies against illegal deductions and unauthorized additional charges imposed on consumers, stating that strict action will be taken for such violations, ARY News reported.The PTA has taken formal notice of companies charging customers extra fees without prior approval. The authority reminded telecom operators that obtaining advance permission is mandatory before changing mobile tariff rates.Furthermore, the PTA vowed there would be no compromise on service quality, emphasizing that clear consumer consent is required for all Value-Added Services (VAS).Operators have been directed to adopt transparent charging systems; the PTA warned that failure to comply would result in severe penalties.The regulator also urged telecom operators to invest in spectrum and infrastructure to improve mobile service quality.Customers were informed that they can contact the PTA helpline for the redressal of their grievances.