Gopro Unethical advertising

I bought A Gopro on line on 23 September 2020 from the Gopro website, Gopro website stated clearly free shipping for orders over $50 my order was $349.00 plus a subscription of $49.00 but then Gopro charged me an additional $100 for shipping, I find this highly unethical to advertise one thing and do another, this is essentially theft and not good business at all! I did send Gopro numerous emails to different departments and to date no response. this is my 3rd Gopro and if this is how Gopro trick and treat their customers, then this is also my last Gopro, I will rather support DJI in future. Very unhappy and disappoint customer.