Shocked by the bad service!

I renewed my contract at the end of the year, and I am SO sorry that I did that!!!!!<br> To start off with, I got the wrong phone, and had to fight and beg to get the right phone, and not wait a week!!!<br> Secondly, NOT ONE invoice has been right!!!!<br> I have phoned the call centre 3 times, send A LOT of emails, and it is STILL WRONG!!!!!!<br> <br> I am not sure what you want me to do??<br> What exactly must I do so that YOUR mistakes can get fixed?<br> <br> I phoned the call centre twice now, and BOTH times I got cut off!!<br> Your call centre agents REALLY do not want to work!<br> <br> How many times MUST I phone and e-mail???<br> What must I do??????<br> Please help me????