Not fulfilling Promise

On Monday 6 April I received an sms saying that I would get a call on Tuesday, 7th to complete the contract for the Samsung S6 I had preordered, and that I would be receiving a free wireless charge and cover with the contract. I never received the call. On Wednesday I follow up on the sms on the Vodacom chat and am told that a person from sales will give me a call. They didn't. Today, 13 April I call Vodacom and am now told they can no longer give me the free wireless charger and cover. So Vodacom is going back on their word!! sales person tells me that maybe they couldn't get through, but I had my phone on Tuesday waiting for their call. Now Sheheena puts me through to Vodacom direct an the call gets cut. This is not on!! Also although I pre-ordered they don't have stock of the S6 and I have to wait!!