The ministry was reacting to a report by Reuters which said that India's shipments from Iran were down 15 percent. It noted this volume of Iranian oil sales to India is unprecedented, according to Tasnim News Agency.
The Oil Ministry statement added, "India is the second biggest customer of Iran's crude oil after China. It did not cut purchases during the sanctions even though the United States put a lot of pressures on New Delhi to do so."
According to the report, Indian refiners bought 450,000 bpd of Iranian oil on average during fiscal 2017-18. The biggest purchase came in July when they lifted 500,000 bpd.
Overall, India's shipments of Iranian oil dropped last year compared with the year before but they have been pursuing a rising trend in the 2017-18 fiscal, the report added.
On Monday, Iran's Oil Minister Bijan Namdar Zanganeh said Iran's crude and condensate exports recovered from a fall in March and currently stand at 2.5 mbd.
Iran, the third biggest OPEC producer, saw March liftings drop 26 percent year-on-year but Zanganeh said the decline was temporary.
"It has increased now and currently all together we export 2.5 million barrels of oil and gas condensates," he said.
Zanganeh also said his ministry was up in arms against possible fallout from President Donald Trump's decision on whether to re-impose US sanctions on Iran next month.
"We have to wait for Trump's decision. But Iran will use all its capacity and experience to protect the country against the consequences of Trump’s decision," the minister said.
Zanganeh also appeared open to possible discounts on oil sales in order to preserve Iran's market share which the country has diligently fought to regain since the lifting of sanctions in early 2016.
"Iran will take all the necessary steps to keep its oil market share because of the political atmosphere and the American president's decision on the deal," he said rejecting reports that ran has given discounts to India.
"We have not given a special discount to India but it is possible to make changes in our prices," he noted.
State-owned Indian refiners announced their plans to raise oil purchases from Iran when President Hassan Rouhani visited New Delhi in February.
Zanganeh told reporters after meeting Indian Petroleum and Natural Gas Minister Dharmendra Pradhan that India's state-owned companies were going to increase Iranian oil purchase.
Before the visit, the Indian government had reportedly ordered refiners to import less oil from Iran in retaliation for Tehran's refusal to grant development of the offshore Farzad B gas field in the Persian Gulf to the Indians.
In New Delhi, Zanganeh also said the two countries had resolved differences over the field, suggesting that a deal between the two countries over the project could be imminent.