Incorrect billing

I have 2 contracts running on my name. After requesting countless times for my invoices to be emailed to me this still doesnt happen so i rely on the website. for the period of June, i went on to the website and found that only one of my numbers had an outstanding balance which i paid 6/07/2015.knowing that my one contract is coming to an end i knew it would be cancelled so i didnt query the lack of charge.<br> 2 weeks later i get a snotty phone call about the outstanding amount (didnt get the callers name) i explained the situation and i was told \it was a technical fault on the website"now with the attitude i got"