Reversed Debit Order

I received an sms in early January stating my account in arrears for not paying my December instalment. After calling to find out why the debit order didn't go off as it had been I was told that the debit went through on the 28th and reversed on the 29th and I was told to check with my bank. My bank came back to say that nothing had been processed from Dion Wired in December, the ONLY account that never processed their debit order on my account. I refused to cal back and fight with *********** call center agents as clearly they will just say that the fault is on my side. Dion wired however ran a promotion in December that stated if you purchased anything in December then you do not need to pay the December instalment, Perhaps this is the reason your company reversed the debit from your side.. maybe you should check the dates of the promotion and the date that my account gets debited and perhaps therein lies the fault on your side. Now I receive emails stating that I must remember to pay my account on time which upsets me as my account has NEVER been in arrears - you are welcomed to go back and check your records for the past few years. There has always been a debit order loaded on my account and now its a coincidence that you run such a promotion and my account somehow had the debit order reversed, this is what showed up on your side yet the bank has no record of a debit order being processed. It irritates me that I now get bombarded with sms's and emails reminding me to pay my account on time.. the very reason I have a debit order in place over which I have no control, but your company does. This is probably the end of my relationship with Dion Wired.