BAD customer service

Ordered an Iphone 10 on a contract upgrade , Vodacom delivered an Iphone 8 while my director was on holiday in Australia. when he returned he informed me straight away that it was the wrong phone. I have been trying to sort this out with Vodacom since January 2018.I get a call now saying: it was reported after 14 days and now Vodacom does not want to correct THEIR MISTAKE! was told the person who signed for the phone should have known it was the wrong phone?? VODACOM MUST TAKE RESPONSIBILITY FOR THEIR MISTAKE!!