ShopClues — I received sms of winning car or cash from im-shpcls after shopping on shopclues.. I want to know how my contact details goes to them...

Address:	Bikaner, Rajasthan, 334001
Website:	shopclues

I received following sms today morning at 08:56 am from IM-SHPCLS:

"Welcome to dear customer congratulation you won First prize for SHOPCLUES Soy company monsoon Dhamal contest ! congrax you won Tata Safari Car or RS. 12, 60000/- You received prize for registration charge Rs. 8600/- only deposit on any bank more details plz contact no.
[protected] Adhik Jankari Ke Liye contact HELPLINE toll free no Call me
[protected]"

i want to know how this type of fake sms delivered to me from shopclues.. earlier 2 days back i shopped something from website and now i received this type of fake sms... how my contact details goes to them...
when i respond on this fake toll free no.. they said that you have to contact another no. [protected] and you are right you won this prize.. and this is truly genuine.
again when i contact on this then a person provide their bank account details to me for online payment of 8600 rs. their sms is as following:

"Tuni Paswan State Bank of india
A/c no. [protected]
ifsc code sbin0008386"

please provide me details how my contact and other details goes to them.. and how this type of fake people actively do this type of fraud.. and right now today they are very very active.. if you want you can detect them...
i want reply from shopclues... i m very very disappointed...