I had this with my old punto, but i did it myself to that car. It happened after i took a hump-back bridge a little to quickly, and after that full lock gave me a creeking sound, that really didnt sound good. My only assumption was it to do with the drive shaft, or something similar. Best way is take it to a garage to get a professional opinion.
If you bought the car from a garage/dealer take it back, they HAVE to fix it. If you bought it privately then you are fully within your rights to demand a refund, as you've been sold a car that is not fit to be driven. You have rights, use them if the car isnt road legal.