Overcharge and breach of contract

Vodacom has failed me once again, after I decided that I shall give them another chance. In August I upgraded to Huawei pro 30 online. This was the deal as seen online 75 Minute Smart Top Up with 1 gig consisting of 25 sms 20GB data once off, 1 Month Free 25 GB Video Play Subscription. This is not what I received. They only gave me 10GB once off.I was assisted by Nomtandaza who assured me that this was the deal I would get. When I received my sms on Saturday morning it says I am only getting 10Gb data once off and I called your call centre and was assisted by Olwethu, who tried her best to assist me . When I called again I was assisted by Megan and then Hilda. Hilda advised me that Nomtandaza would call me on Sunday, which she did not. Hilda also advised me that my contract was done telephonically and therefore I only received 10GB data once off. I then said but Nomtandaza assured me I would get the same deal as online as I asked her if I could do it online and she said no its fine , she will assist me and whether I did it online or whether she assists me it will be the same deal. Hilda advised me it’s because I did it telephonically therefore I only received 10GB as the online deals and telephonic deals differ. Furthermore Hilda said she does not know why Nomtandaza did not put me through to the Online department, but yet when I called the call center said she is upgrade Online. Please advise how this can be and I demand that I get my 20Gb data as advertised and as promised. Please also be advised that you are charging me for a smart Top Up S and I took out Smart Top Up 1Gb Another reason for your incompetence and ********** ways . Please see the attached of my contract I upgraded to.( sent to them via email) they ignoring my emails Please amend my statement and account and remedy the 10GB to 20Gb to avoid me taking further steps against Vodacom for false advertising and exploiting customers with overcharging. This is false advertising and should be brought to light if I do not receive my full 20Gb as promised by Nomtandaza.

Please remedy this situation ASAP as you have really bad customer service.