Sold a contract with X, delivered a contract with Y

I agreed to a contract (based on an in store advert) that contained 2G data , 50sms and 100 minutes per month. When the sales person loaded the contract on the system the minutes didn't load. She immediately raised a ticket and promised this would be rectified. The service centre attempted to call me (but as I seem to be constantly out of range and unable to receive calls) they just closed the ticket without talking to me. The contract does not include 100 minutes, sorry for me. HUH???? So I agreed to & signed up for one contract... and now am saddled with a contract that does not give me what I need. What can I do about it.... NOTHING apparently!!! Log a call! for the 4th time.... or take to social media.