Vodafone India — sim ported. not activated. 15 days

This problem seems to be a common one that consumers have posted over the years!
I ported my karnataka circle prepaid airtel sim to vodafone. Then i keep getting sms that i need to call 59059 to activate it but the call goes invalid! I got this done in a bangalore vodafone store and now i'm in mumbai. Customer care and mumbai store personnel are asking me to go and check with the store where i did the port! They won't check the issue themselves but expect customer to go back to the store in a different city for no fault of mine. It's been 15 days and no resolution.