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Ontario ombudsman Andre Marin says the complaints continue to mount against Hydro One.

Since Ontario's ombudsman announced an investigation into Hydro One's billing practices and customer service last week, his office has received almost 2,500 more complaints.

With the total now at 3,100, Ontario's ombudsman has told his followers on Twitter not to despair.

Andre Marin said his staff is meeting weekly with the utility in an effort to sort out individual cases — customers who have had issues ranging from no bills for months, to unusually steep bills.

In some cases, Marin said, customers' houses burned down and they continued to receive hydro bills.

As for the number of complaints, Marin said they continue to rise.

Prior to the investigation, Marin said he had about 650.