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SaskTel says about 9,000 customers were overcharged ranging from a few cents up to $100,000.

Spokeswoman Michelle Englot says they believe the errors happened in the Nov. 23-29 billing period.

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The Crown corporation was in the process of installing and upgrading new network hardware when the errors happened.

She said it involved billing Saskatchewan data usage at U.S. data rates.

Englot said customers who have been affected will be notified by text message or phone and will also get a letter from SaskTel within the next week.