O2

I chose a plan.. decided to buy..went to checkout..entered details (even though it already has them) & when I try to put in my D.O.B. it wont allow any date pre 2000... after about 50-60 failed attempts im at my wits end and have prettt much decided ...

Im currently with tesco mobile but want to find out what deals O2 can offer me but it seems impossible to speak to an advisor..can anyone help please.