I have just purchased an. i have just purchased an LG rhin mobile phone from tesco, as my daughter

Question

i have just purchased an LG rhin mobile phone from tesco, as my daughter dropped her phone and broke it, and now i find that i am tied into the contract for anther three months with another network as i bought this mobile for her xmas last yr, tesco say that they wont give an ulock code until ive paid 3 months on pay as you go, is there some way i can get the unlock code for this LG rhino 290 mobile phone