Vodafone India — Postpaid plan has been changed

Address:

Mumbai City, Maharashtra

Hi, my vodafone paispaid number is [protected]. In current month vodafone has been changed my plan to E_connect_3g_299_2015 . As per old plan I have unlimited internet data plan and as per new plan E_connect_3g_299_2015 I have 750 mb data . Now I have used 1152mb data as thinking that I have unlimited data plan . Two days ago when i have contacted to customer care they said you will get chnaged for more data usage above 750 mb . Kindly help me in this . I never changed any plan but still they are changed my plan . And now charging for extra data usage