False information

I ordered a headboard online and the stipulated delivery period on the item AND at check out was 7-14 days. Upon payment I received an email from sales that the headboard was yet to be manufactured and delivery would be between 5-6 weeks. That's almost 2 months! I would have never committed to a purchase had this been on the online shop and at checkout. Why false advertise, why give false information about availability of a product and the delivery period?