MTN/DSV don't deliver

After 2 weeks I have decided to give up. I am upgrade my contract and my wife's contract which included 2 new cell phones. On the 19th September I received an email from MTN saying the application had been approved with an order number and a DSV tracking number. On the 21st September at 11:59 I received a SMS from DSV asking me to contact them to arrange delivery. I phoned them and was told that they don't have my contact details so they couldn't deliver the phones. They said that they would ask MTN for my contact details. Ever since then I have spoken to different people at MTN who have promised to sort it out. On the 29th September I received another SMS from DSV asking me to phone them to arrange delivery. Same story, they don't have my contact details. I don't understand why it is so difficult for MTN and DSV to sort this out.