Wrong deduction

I finished paying off my contract in June, <br> yet there are still debit orders going through on my account despite me calling them in advance to cancel my contract.<br> <br> my contract was then moved to pay as you go, yet my phone is now blocked because i am apparently in arrears?<br> how is it possible to move my account to \pay as you go"if i am in arrears?<br> <br> and to top it all off... another debit order went through yesterday and after calling them i was told to wait three working days to reactivate my account. """