20 years of brand loyalty, what for?

The last year Ive seen a drastic increase (double) in my monthly bill. looking into my usage there are numerous times where i have to redial a voice call to get an audible connection (my cost) or the call is simply cut/dropped even when Im not roaming, (my cost to redia)l. Every day I send numerous pictures via MMS or whatsapp, most times it takes 5-10 attempts to send a pic (retrys at my cost), Trying to open a website page can take easily 5 or 6 refreshes before i can actually view any content, that is if i have connection. Without moving i can go from 1 bar to full signal to no data coverage to no connection at all without moving more than 5 metres. I logged a complaint to which I was informed the base station i connect to was a problem and will be upgraded, but couldnt tell me when. I accepted a rebate offer on my account which to my surprise was only on the subscription, Im still not sure how that offsets my higher monthly voice/data costs.In addition to paying for vodacoms poor coverage Im paying for an expensive smart phone with all the features that the network cannot even support, whats the point is of upgrading to a new phone every 2nd yr then?