Change of address....task too difficult to execute

Worst service ever. My interim Wi fi router was supposed to be delivered last week Monday. Ram Couriers told me I had to phone Vodacom to change my address as they wanted to deliver at home. I work all day and therefore phoned them on the same day to change address. It is now 8 days later. I have phoned 6 times subsequently and every consultant has a different story. I also have to provide the new address every time I phone, as if they have no record of any of my previous calls. Also phoned twice today with promises of call backs....and guess what? Still waiting. Absolutely pathetic......how long can it take to change an address for delivery? Obviously not a quick fix. Worst customer service ever.