Half order with false promises

Ordered a burger, chips and a mcflurry

Got a call from a driver at the shop saying there are no mcflurries, and I would receive a coupon when the driver arrives, I was ok with this.

different driver arrives, I get a stapled up bag of contents, and no slip.

When checking my order there was only a burger, no fries, and no coupon.

I tried contacting them back on the numbers they called me on, no response.

I tried mailing mr delivery about it, but their website refuses to accept cellphone numbers of any kind and won't allow me to finish the mailing process.

I basically paid double for just receiving a burger and I cannot get a hold of Mr Delivery, because their contact us page is broken, and always wants me to validate my phone number, even with the number perfectly entered as an international or local number. Their site even autofills the number from international back to local, and still fails having red on the phone section, but the top of the page says "please fill in the following fields correctly" and says nothing.