Launching a scathing attack on Congress, BJP President Amit Shah on Monday said that we used to hear about new scams every month under the UPA government but the NDA delivered a scam-free stable government. 'There is not a single case of corruption Modi government in 3 years, even our opponents failed to find any single charge of corruption against us. We have given a stable government. However, in UPA rule every minister believed themselves to be the Prime Minister. No one considered Manmohan Singh as PM,' said Amit Shah in his press coference in Lucknow taking a dig at Congress.