Ferrari Team Principal Maurizio Arrivabene says that the squad's victory at the Hungarian Grand Prix proved doubters wrong, following a few difficult races for the outfit.
Ferrari claimed victory in the second round of 2015 in Malaysia but slipped off the podium in Canada and Austria, while it was firmly third best in Britain prior to rain late in the race.
Vettel and team-mate Kimi Raikkonen jumped into first and second at the start in Hungary and while Raikkonen was forced to retire due to a power problem, Vettel cruised to a win which puts him within 42 points of championship leader Lewis Hamilton.
"Over the past few weeks, we had had comments from people who said we were in a slump, people who obviously can’t or don’t want to read the numbers," he said.
"As a matter of fact, we had anticipated long time ago that there could be ups and down in the course of the season, but that does not mean that we were stepping back.
"Both Seb and Kimi had a tremendous start and being able to drive in clean air surely made a difference in terms of tyre management, as we knew the first two sets of Options would perform very well."
Arrivabene expressed frustration that Raikkonen's mechanical problem prevented Ferrari from taking its first 1-2 finish since 2010.
"I am very disappointed, though, that Kimi did not make it to the end, because he was having a great day. Congrats to him.
"This is Formula 1 and we must accept the lack of reliability as another challenge for the future. We won the race, but still keep our feet on the ground and remain humble and committed."