Credit Card — Missed Calls

Calls from Citibank DSA,

I am writing this from Ahmedabad . I am getting Missed Calls since last week. I am getting the call from[protected]/900. First of all two days i got a call at 3 pm in afternoon and then from next day onwards at 2-20pm. First of all he calls me up at [protected] and then i dint pick up the call then he called me on my landline number[protected]. Plz see to this that who calls this way. We are mentally harassed by such missed calls.the guy who calls us cuts the call and everyday he calls us around 3 in the afternoon. Plz let us know who does all this.

regards,

KAUSHAL