In this materialistic world, almost every other service vendor tries to wriggle the hard earned money from the customers. Airtel and Citibank is no excuse to this.
With Airtel when you get a new connection, they automatically enable Hello Tunes (though you request them not to enable) since it is free for the first month. The customer is never told that it is "only" free for the first month and from the next they will be charged for this petty service. Secondly they never intimate the customer that such a service has been enabled without their approval. Lot of such options are taken for granted.
Secondly, Citibank is very famous and notorious with such promotions. They will send you a life-time free gold credit card without your request on applying for a savings account. Apart from this they will enable Ready credit and all other such options automatically and keep charging heavy penalties and dues if you happen to violate their laws/policies. With a dismissal quality of service they pester you continuously with promotional offers. Nothing useful could be got from them.
I just came across an illogical incident with Citibank. I requested a bank statement and they promised to deliver it through courier only to my residential address. Since this being an account statement I had to sign and collect. With no body at my residence during office hours, the statement will be sent back to Citibank which they will duly thrash for security reasons. And the worst part is yet to come, for such a service I have to pay them charges.