These complaints are just the tip of the iceberg.
tip of the iceberg
idiomA small indication of a larger possibility; the first part encountered of a problem that is much bigger than it seems.
Origin
first recorded 20th c. disputed originFrom the fact that floating icebergs typically have about nine-tenths of their volume below the surface of the water. Early 20th-century uses of the term are believed to have been influenced by the sinking of the R.M.S. Titanic on April 15, 1912 after it struck an iceberg.
The missing money we found is only the tip of the iceberg; the full fraud is much worse.
What the investigators had uncovered thus far was merely the tip of the iceberg, hinting at a conspiracy that reached into the highest levels of government.
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arse over tip
Tumbling or falling; upside-down.
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pro tip
A useful piece of advice.
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tip of the hat
A gesture of acknowledgement; often, an expression of gratitude; originally by doffing one's hat.
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tip of the ice cube
The first aspect of an insignificant or exaggerated problem or situation.
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tip one's hat
To acknowledge or show respect; to honor.
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tip the scale
To change the fortunes, either positively or negatively.
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tip the scales
To turn to one side of a balanced situation.
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tip the wink
To give (somebody) a hint or suggestion, as if by a wink; to ask or tell surreptitiously.