Cellphone contract

My husband and I took out a cellphone contract on the 1st December 2017 with Vodacom it was a P10 and P8 for R499 a month. On that day we were promised that we will receive 10g data for 3 months and R150.00 airtime. We only received the P10 and to date we have not received the P8. I called Vodacom in promenade and spoke to Nashreen Adams and enquired about the phone she was so rude and said she can’t just help me she has other customer’s as well and she put the phone down. When we called the call centre regarding the 10g data they said that we will not be receiving it and if the store told us we must get it then we need to go back to the store we went back to promenade Vodacom and to date it has not been sorted. We asked to cancel the contract because we did not receive the P8 or the 10g data they said we can’t cancel it because the P10 was already opened. Today is the 12December yet we not receiving any feedback from Vadacom and we would like to cancel this contract.