I have been charged for pipes, but the company inadvertently put the wrong price on the invoice, they have overcharged me by $1330 + gst, they now say I have to pay this as they can’t change their invoice and instead next time I purchase over $2000 of product they will credit me the $1330+ gst.
Can they legally do this or do they have to issue a credit as it was their mistake?
As i don’t have a spare $1433 to be able to give them. Thanks