Unhappy

I am writting this on behalf of my sister who has had the worst experience with Vodacom. She has a contract with vodacom and about a month or so ago she received a call that she qualified for an upgrade for a samsung S8 for R685 which came with a J5 for free. Everything was processed over the phone and was told phone would be delivered, the day the phone was meant to be delivered she received a text that phone has left but she never received the phone. She followed up with vodacom and was told the phone was delivered to the wrong address and once phone was received back it would be delivered. A week passed and no delivery, she called vodacom again and was told that the deal had ended and could not get it anymore. Now surely this was not her fault and it is not fair, first agent dropped the phone on her and second agent said will escalate matter and someone will call her. This took days until she called in and was told she will get her phone as promised and all details where confirmed. She was called the next day and again detaiks where confirmed and was told 3 to 5 days her delivery would happen ( this was saturday). Thursday my sister called vodacom to check on her delivery and was told they could not confirm and she must wait a confirmation from the delivery people. Friday my sister called again and was told the deal was cancelled because they tried to call her and could not get hold of her which my sister did not receive any call nor a missed call from vodacom. This has to be the worst service vodacom has ever given us and we have been vodacom customers all our lives. This matter needs to be resolved urgently.