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Complaints about Canadian telecom services have shot up by 44 per cent, with billing mistakes and misleading contract terms the most common source of consumers' gripes, an industry ombudsman says. "Incorrect charges" and "non-disclosure of terms" accounted for 29 per cent of all complaints in the six months ending Jan. 31, the Commission for Complaints for Telecom-Television Services (CCTS) said in a mid-year report.

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For the first time, Freedom Mobile ranked among the top five telecoms with the most complaints, the CCTS noted. But that may have to do with the telecom's rapid expansion. The Shaw Communications-owned wireless provider, formerly known as Wind Mobile, added nearly 320,000 subscribers in 2018 and now has around 1.5 million customers, the Globe and Mail reported. Watch: Data-only cellular plans are coming to Canada. Here's what to know. Story continues below.