O2

I just topped up £10 then changed tarif from the £5 one to the £10 big data one thinking it wouldn't switch me unless I had £10 in my balance and I've lost £5 credit when it switched me over, I don't want to have to top up another £10!

havnt had any signal here all day! its not just my phone its everyone on o2...please can you get this sorted ASAP...thank you