BAD Service

I changed my cellphone on the 7th June, only my cellphone not my sim card or cell number. I bought electricity on my bank account as I always do but have still not received the voucher on my cellphone. I have called Nedbank 3 times but still the problem has not been resolved. I was told to call Vodacom which I done, they have put on all the notifications but still no messages has come through. Nedbank keeps telling me they will get back to me in 3 to 5 days but I keep calling in to try to get the problem solved, the customer service is appalling and absolutely unacceptable!