Hi, i am wondering if anyone can help me. I have the £10 tesco contract. last month bill dated 8/10/10-8/11/10 i was charged £78 for excessive usage. this month ive been really careful and not gone over my allowance however i recieved a bill dated 22/10/10-8/12/10 for £26. When ive rang tesco to ask why ive been charged for a date in oct, a bill which ive already paid they have said they forgot to charge me for that particular date last month and so have charged me this month. Is this allowed? if they missed it off the bill isnt this their mistake?