Xperia Mini/pro :: Unable To Have GPRS Settings?

i am using GPRS services for now almost an year and half. i was having windows mobile till 16th Sept'11 on which i was using gprs very happily but on 17th Sept'11, i did purchase Xperia mini from G. V. Puntambekar(Pune based dealer). The phone is now installed OS as Andriod 2.3. Ever since i have purchased the phone i am not able to use GPRS services on it. I did speak to Airtel (my current service provider) and whatever settings they have given but not able to save them on my phone bcoz it asks for MCC and then MNC code. hence after talking to Airtel somehow i got these code. but depite of entering them into the settings along with other settings, i am still not able to use gprs. i was told that once you save the gprs manual settings it creates a profile on phone but it is not saving any profile on my phone. Sony dealer is sayingthat it is a service provider problem and Service provider is saying that we have given you all the settings so it is a phone manufacturer's problem. I am getting penalised in these two contradictory statements. Without GPRS the phone is like any ordinary phone. I feel like cheated even after paying Rs.13000/- and buying Sony's product. Feels like lesson learnt that never buy SONY product again..