Empty Promises!!!

Took out a cell phone contract with them and was suppose to get billed on the 28th of May. Needless to say that the debit order didn't get off. I followed up twice with the call centre and they said it's fine we will debit you in June. Not feeling secure, I personally went into their branch in new junction (Sat 30.05.15) and queried again and got the same response from them saying \don't worry"we will debit you in June. A couple of days later I ended up using the money and on Monday they conveniently blocked my phone and when I call them they are saying that I owe them money and my banking details were incorrectly given but upon checking my bank statement and the account number that they have is exactly the same. Now I am sitting with a phone that cannot do ANYTHING and can't arrange payment either because of what they told me 3 TIMES and put it in my budget for end of June. I am a new customer and this is PATHETIC"