Airtel Customer Care Kolkata use Trick to stop porting their customer to another provider

Our co-founder Saheli was using the Airtel number for a long period of time, most probably he is using it from 2007 end. But recent tariff hike from Airtel led her to port it to another provider (she is thiking of Tata Docomo). She collected the Unique Porting Id from Airtel & was thinking about going for the MNP. One day when we were just talking about this blog suddenly a call came from +914018XXXX. She picked up the call, it was a Customer Care Representative. Well, we all know about the Good Reputation of the Customer Care [:-|], she put the call in handsfree speakerphone. Below was the conversation between them [Read S as Saheli & C as Customer Care Representative]

C: Good Evening I am XYZ[Name can not be quoted] calling from Airtel.
S: Hm.
C: Mam did you applied for a mobile number portability?
S: Yes, I applied just yesterday & received the Unique Porting Code.
C: But Maam why you want to switch your number to anyone else?
S: See, call tariff for Airtel is Rs.1/Minute whereas the normal call tariff for Docomo is Rs.0.01/second. And your call charge reduction tariff is way high from some other providers. So why should I pay more whereas I can pay much less without changing my number.
C: Who said you Maam that Docomo is giving normal tariff of Rs.0.01/Second. They are just offering a pack of a duration of 1year or less. No provider gives you a tariff like this for life without any promo packs.
S: What? Is it so? But as far as i know from Internet, mMbile Retailers, Tv Ads all saying that Tata Docomo's normal plan is Rs.0.01/second or you may say pay per second plan. Are all of them lying?
C: Maam there is no such plan I know. Ok Let us give you an offer. We will activate a tariff for you the tariff is 1p/2sec for any local number 1p/1sec for all STD for free. And this will valid for 6months. And your purpose for cheaper call rate is solved.
S: But temporarily. Ok that's not an problem if call rate is reduced I am ok with it.
C: Thank you Maam.[in the mean time I quickly flashed, I just imitated & whispered to Saheli to ask about the full tariff in details]
S: Oh excuse me. Can you please say the full details of the tariff you just wanted to give me.
C: (Voice seemed to be not so much interested as she was in the starting of the call) 1p/2sec for local calls & 1p/sec for std.
S: No charges at all for life?
C: First 10 days from activation it is free, from thereafter you will be charged Rs.1/day as an rental.
S: WHAT!!! You didn't say that before. I don't want this tariff I would love to switch to another provider.
C: So you don't want this good offer?
S: This offer is good for you not for me. Why should I pay Rs.1 per day.
C: So clearly say what do you want, to be with us or not.
S: Absolutely no.
C: There are no such 1p/sec plan in any network Mam.
S: There is.
C: There isn't Mam, everywhere you have to pay rentals.
S: No, you're wrong there is & i'd love to switch
C: Ok [Sounded like she thrashed the phone]

Now see Kolkata, this was the trick Airtel Customer Care is playing. They are not telling everything to their so called valuable customer. This is clearly a cheating I think. What do you say.