Wasting my time

Upgraded online in December, received the phone Xperia Z5. Contract changed as the one I currently have is no longer available. Have to pay extra amount for phone monthly, no one can tell me when I will start paying for this phone. Phoned 082 111,***,***,***4. Your consultants does not know whom has to help me to find out when I should start to pay for this phone, just sends from one department, to another and back again. Wasting my time. Hope that all these calls are free, I am not paying for their incompetence. Is this phone for free? As I am trying to pay for it, but seems like there is no concern regarding my problem. Or will the fault be discovered in months and then I will be debited for a ridiculous amount. Also they send me the incorrect sim card for the new phone(duo sim instead of nano sim). I am not going to phone again, because it takes me more than an hour and still no resolution. Please assist me as I am regretting the decision to commit to Vodacom for another 48 months already, and it hasn't even been a month since upgrade. Thank you.