Why stay a loyal customer to Vodacom?

After weeks of struggling to finally get the upgrade done for an old man living with me we got no response. So we gave vodacom upgrades department a call just to be told that he did not give them the authority to do the upgrade. After further investigation from their side it was found that he did. Ok so acceptable error we can deal with. $ days later we still haven't heard from them only to be told that the upgrade has been cancelled due to them not having stock. When I asked why where we not informed I was told that the lady (Bridgette) that did the upgrade for us originally should have phoned us and told us nut an email would be sent to her to contact us and resolve the matter. Another 3 days later and still no word from vodacom. How can you advertise a product that you don't have and then cancel without informing your customer? Online upgrades is supposed to make it easier not cause endless problems and phone calls.