The regulator has also asked the service provider to furnish the number of subscribers "adversely affected" by increase in its tariff plan.
According to sources close to the development, the overcharged amount would run into crores of rupees. However, this could not be confirmed.
In a directive issued to the company, Trai has asked Tata Tele to assess the total amount charged from subscribers under its Walky service. The regulator has also asked to submit these details within 15 days. The directive, signed by Trai Advisor (economic division) M Kannan, was issued on Friday.
Walky is the fixed wireless phone (FWP) services from Tata Tele and the services were offered on the CDMA platform. An FWP is a landline connection, with the last mile connectivity offered over wireless.
When contacted Tata Teleservices Corporate Affairs President Ashok Sud said, "We are in receipt of the letter. We are studying the said document and will take appropriate measures. As a responsible corporate, Tata Teleservices is committed to comply with all industry regulations and policies. Incidentally, the matter is sub-judice in the Supreme Court."
