Airtel — Airtel blocked my dad's number without even having the common courtesy of informing the user beforehand

Address:	600034
Website:	www.airtel.in.com

My father bought this good for nothing Airtel connection because Airtel advertised in his office, which is Central govt. Airtel postpaid supposedly provided customized internet & call packs, So my dad bought one
([protected]).
First of all, they never fully gave the packs they told they ll provide.
Second, They overcharged my the bills
And, when my dad emailed them about this, He got no response.
Finally some "brilliant" customer care guy replied back asking for details that were clearly given before itself.
After waiting for their reply, they BLOCKED the number. WITHOUT INFORMING HIM. WHAT A PATHETIC SERVICE.
My father wants the connection back.. with an apology for your stupid & insensitive service.