[Resolved]  Citibank — Annoying "blank" calls from Citibank call center

I have a citibank account . From the last one year , I have been receiving phone calls from this number [protected]. When I pick up , most often , nobody bothers to answer almost making it seem like a blank call. Sometimes , in a day I get 3-4 such "calls" . I know this is a citibank call center number because on one lucky day , somebody actually spoke when I picked up the call and told me that he was calling for a credit card offer from citibank . I had very politely and clearly told him that I am not interested and requested him to not make any more calls . The calls stopped for a while , but started in a month's time . So that has been the pattern now . Almost every time, inspite of picking up the call they don't answer and if I don't pick up they go on and on , wasting the battery of my cell phone . This is really frustrating . Today I have applied for the "Do Not Disturb" service from citibank but I am not sure if that would also be of any help seriously . Hence I am going ahead and putting in a complaint here . Any citibank representative who reads this , please ensure that your telemerketers do not give "blank" calls to your customers . It is rude and disrespectful.