'Sneaky'
A separate poll of 4,500 students for the report found 58% of respondents had experienced content changes or fee increases after their course had started.
A fifth found an advertised module was no longer available or the content had significantly changed.
"We're already paying too much but then to put it up £500 each year is something that I feel was sneaky," said one student.
Another complained that a university course had been moved from Newport to Cardiff, which was "very likely to prevent me from being able to progress onto my third year".
The researchers said students were reluctant to complain - 17% experienced a problem in this academic year, but only half of them complained.
Of those who did complain, 58% were dissatisfied with the response and 48% felt ignored.