upgrade

I have received a call in May 2021 from rewards company agent (that I thought is from Vodacom sales agent), telling me about the offer that Vodacom would like to give me, because I was due for upgrade. The offer is that on *** number I will receive 20GB of data and my monthly premium will increase with R10 and on the other number I will receive a Samsun phone with 1 GB of data.

When I check my monthly premium I see that its increased with more than R10 as communicated telephonically and I am not receiving 20GB of data every month as promised instead I receive airtime of R500 every month. i have called vodacom client service they did not help me, they keep on saying they will look in to the matter and get the recording of that conversation till today no help from Vodacom.