Bad Service from Vodacom

Vodacom is great network but my Father have 3 contracts cellphone contracts with them my contract my sisters contract and His own contract but for the past 24 months I don't know what have been going on with Vodacom internally because we started the contract receiving an amount Airtime and data and then it changed to just data no Airtime then it changed again to just Airtime no data but that is not the ultimate the ultimate ***** up was when we went to upgrade all of a sudden our contracts witch have been 2 separate contracts for about 10 years now we were told we now had only 1 contract and can upgrade only one device and we have been with Vodacom for year's now and now with this last contract we experiencing all this problems.