Telecom companies today told the Supreme Court that entire sector is under huge debt and they have to pay big price for spectrum, therefore zero tolerance on call drops should not be imposed on them. Refuting the allegations of TRAI that the telecom service providers are making huge gains in the sector, the companies told the apex court that they have been investing hugely on the infrastructure. "They (TRAI) said that we have been making Rs 250 crore a day but what was not specified was that we are under huge debt. We have to pay over Rs 3.8 lakh crores as debt. We are buying spectrum at Rs 45,000 crore, which was earlier Rs 1,658 crore. "We are not gaining anything and our rate of return is less than one percent at the end of a year," senior advocate Kapil Sibal, appearing for telecom operators, told a bench comprising Justices Kurian Joseph and R F Nariman. The bench reserved its verdict on the issue. Sibal said that TRAI had compared India with China but in that country the spectrum is given for free to the top three telecom companies which are state run. Sibal said that like TRAI worries for consumers, so do the telecom companies and no one wants the call drop to happen but the factors responsible are beyond their control. "Our tariff is lowest in the world. We are serving over one billion subscribers in India and we are one of the largest contributor to FDI and provide a million of jobs," Sibal said. He said that although Telecom companies have largest subscriber base in India but have the lowest revenue and also the Industry's revenue is gradually going down. Sibal refuted the allegations of TRAI that Telecom companies are not investing on technology and towers and said that in past 15 months over two lakh towers have been installed. "We have installed over two lakh towers in past 15 months and every third minute a tower is being installed. What has been done in past fifteen months has not been done in past 20 years," he said. COAI, a body of Unified Telecom Service Providers of India and 21 telecom operators, including Vodafone, Bharti Airtel and Reliance, have challenged the Delhi High Court order upholding TRAI's decision making it mandatory for them to compensate subscribers for call drops from this January.