The phrase "made an increase" is correct and can be used in written English.
It is typically used to describe the action of causing or bringing about an increase in something. An example of its usage could be: "The company made an increase in profits thanks to their new marketing strategy." In this sentence, "made an increase" means that the company took action that resulted in an increase in profits.
British Airways passengers were hit with a further rise in fuel surcharges today, after the airline said the continuing record price of oil made an increase "unavoidable".
The increase in rock engineering projects over the last decade, has made an increase in the importance of the determination of the rock mass parameters.
Many analysts have expected the Fed to raise this benchmark rate between late this spring and the middle of next year, but the withdrawal of the interest rate promise has made an increase seem more imminent.
But the restrictions on offshore drilling that followed the 2010 Gulf of Mexico spill have limited domestic oil production, and the disastrous blowup at Japan's Fukushima plant last month has made an increase in nuclear power politically untenable.
The union's president, Bob King, has made an increase in entry-level wages a top priority in negotiations for a new national contract to replace the current agreement, which expires Wednesday.
The central government made an increase in domestic consumption one of the priorities of its latest five-year plan.In this section The mystery of the Chinese consumer Who owns what?
The fast growth of wireless communication networks has made an increasing demand for spectrum and radio resources.
Norwich City have made an increased offer for Leeds captain Robert Snodgrass, 24, as they look to reunite the midfielder with Bradley Johnson and Jonny Howson.
I made an increasing number of mental notes to avoid conflict.
Governments of developing countries make an increase in living standards a primary goal of national policy.
The only thing bold about it are accounting tactics worthy of Enron that are designed to make an increase in emissions look like a decrease.
