Vodafone — Vodafone false claims of internet data

As per the authentic codes of Vodafone, I checked the best deal offers by typing *121# from my phone. It showed that on a recharge of Rs 58, I will get 500 MB of mobile internet data, for 15 days. I did that, but I got only 385 MB valid for 14 days. I called the customer care immediately and they said that it will be rectified within 24 hours. After 24 hours, nothing happened, so I called again and now they tell me that I will not be given the remaining 115 MB because the offer is 385 MB for Rs 58 only. This is unprofessional, Cheating and fraud. Not to mention, the decisive advertisement by the Company.