Brand new Router not working,brought back in 3 days.Router is not replace .They send it for advanced repair and I still without my router

I DATAupgrade on the 7th of March at Vodacom in the Garden Route Mall with data and router. I charged it overnight ,but it did not work. I charged it the night of the 8 th and it still did not work. So on the 9 th ,friday I went to Vodacom Store and told them that it does not work. So they said that I must bring the box/package,which I did the Saturday the 10 th. So this was only 2 and a half day with me and I did report long before the 7 days. They said they must send for repair. I said but they need to replace,cause it was from the beginning not working.

Now they are still sending messages that the router is in Advanced Repair. This is unaceptable..

This is bad service. Can you please help to solve the problem? Many thanks,I believe that you will be able to do it. Regards Anita Erasmus George..