I have been with my current internet service provider for about 2.5 years. 12 months ago, I contacted them to remove some services from my contract. As there was a change to the monthly charge, I provided them with my bank details so that they could create a new direct debit (even tho it was exactly the same bank a/c as previously). I promptly received a letter from the ISP confirming that the DD had been set up. About 4 months after that, I received another letter from the ISP telling me that due to their own error, I had not been billed for the last 4 months' service. The letter assured me that I would not be charged for the 4 months, and asked that I resend my bank details so that the DD could be created (and said if I did not comply, I would be disconnected). I duly did as requested and provided bank details for the DD, and have enjoyed uninterrupted internet service ever since.
I have just done my annual "financial audit" and now notice that the ISP still hasn't set up a DD so, in effect, I have had free broadband for the last 12 months.
I am about to contact them and notify them of their error, but, I'm wondering what they are likely to do with regard to the last 8 months' unpaid service. Is it unreasonable of them to ask me to pay the amount I owe as a lump sum? And am I within my rights to pay the amount owing in installments?
Thanks for any advice - I'd rather phone them fore-armed with information regarding my payment rights.