Not Receiving What I Agreed On.

I am very unhappy about Vodacom.

I upgraded to a deal which was 2x Lenovo M10 tablets. I asked the lady about the tablets and the price per month a couple of times. When the tablets arrived and I opened the box, I saw it was Two Lenovo M8 tablets. I called the call center as the courier guy instructed and they said that the system show 2x M8 TABLETS after I asked the lady about the tablets (M10). The call center said that she will lodge a complaint and they will listen to the tape on what we discussed and come back to me within 72 hours. Its been a week and I still didn't hear anything from Vodacom. I received an invoice of R999 for payment end of February and then payments of R640 thereafter. The tablet deal I agreed on was around R460/R480 per month. I Am very upset and totally not satisfied with the product I received.