Cell phone, wont charge

MY CELL PHONE FOR SOME REASON WHEN I TRY TO PLUG IN THE CHARGER BECAUSE THE BATTERY WENT DEAD I HAVE TO WIGGLE THE PLUG IN THE PHONE TO MAKE A CONNECTION SO THE PHONE WILL CHARGE.NOW my battery went completely dead so i pluged in the charger now when i wiggle the plug to make a conection it wont at all now. i have to say i thaught it was the charger so the store i got it from one month ago they gave me a new carger but i still had the same problem only it wasnt too bad as long as i didnt let it go completely dead like i did this time.. i dont know if it is the phone wire port or the charger if any body has any advice i really would appreciate it thank you... JOE