HDFC Bank — credit card

Address: Sonitpur, Assam, 784001

Sir,
I applied for credit card yesterday at tezpur branch, assam. I was told that verification call will come and i should reply it.
Yesterday one call came for verification.
Today two calls came from two ladies numbering [protected] and[protected]. They told that they were calling from hdfc bank and tried to force me to take insurance wallet for one year at rs 1899.00. I was not told about it before and i do not want to do insurance wallet.
I have now started to wonder what more tricks your people have to extract money from customers as i assume it is with your consent that these workers of you are pressurizing customers.
If not how come they know my details?
I refused to do insurance wallet but will see on account only if your people have deducted money from my account.
If verification is so much necessary, why don't you mail for confirmation?
I see tremendous lapse in customers security.
Please reply.
Thanks,
Yours,
Dr. Dipta kantha bora
Tezpur, assam