Vodacom worse cell phone company !!!!!

I am disgusted in Vodacom !!! We have a contract with them this would be our 4th year never missed a payment under my husband name but money comes from my bank account, 1st they call my husband selling us an early upgrade at less the price with a free phone so ofcuz we agree. When phone comes they send a modem and additional phone ,we tell them this is not what we agreed to so they must collect the devices, they take 3 weeks to collect and still charge me the full price ,now I look at the bill as my son says he did not het his airtime....and what do you know .Vodacom has changed my contact to something niether myself or my husband has agreed to ?????please explain how is this possible .You sell me a lie then you have the nerve after taking 3 weeks to collect your devices to charge me the full amount even tho I didn't use it and now you wana bill me again the same as if I still have the phones? Put me on a contract I never agreed to ?without my concent !!!!!