Ontario's Progressive Conservative Party has issued an apology after supporters received a letter that looked like an invoice.
The party released a statement, saying it "regrets" sending out the correspondence.
The Tories note the letters were sent out by one of its vendors.
One man says the letter he received indicated he owed $800 to the party.
Meanwhile, the Liberals and NDP are calling for Elections Ontario to launch an investigation.
Both parties are also encouraging the PCs to return any money they received as a result of the mailouts.
Gov't Wastes Too Much Money: Candidate
Gov't Pressured to Investigate Whale Deaths
Niagara Falls Receives Payment for Casinos
Niagara Falls Man Charged with Child Porn
Toronto Man Charged with Drug Trafficking
Respecting Taxpayers, Douglas Memorial Candidate's Concerns
5 Teens Charged with Threatening Couple
Niagara Region Working to Help Business