Debit order still going down after contact termina

My contract with Neotel has been terminated on 21 March 2015 and their equipment was collected from me on 24 April. The debit order however has been collected from my bank account on 1st of May and 1st of June even after my contract has been terminated. <br> When calling the call center nobody seems to be able to help me, they can't put me through to the correct departments, it seems there are no communication between departments. They promise to call me back on the issue and then I never hear from them.<br> The customer service within this company is the worst I have ever encountered and it has now reached the point where they are steeling my money!