Poor service

Took a contract iphone7 with Vodacom online last year december and the phone was delivered to me this year January cos i was away for holidays, did not open the box cos the phone was a present for my daughter, 2 days after the phone was delivered decided to check the invoice, thats when i realized Vodacom sent mi a wrong phone.. Huawei j7 instead of an Iphone7, immediately i called Vodacom to come collect the phone, till today they haven't collected the phone instead they deducting my money, i called Vodacom more than 20 times with no help, even sent them emails but no 1 is calling me bck and now i dont know what to do... Pls assist