WFS Personal Loan

I have a binding agreement with WFS for a personal loan with an agreed monthly date to collect installment from my account via debit order.<br> this has being running smoothly for several months but the last 2 months has being a total disaster, notwithstanding the fact that they send me notification that because of non banking days my debit order will only run on the 17 August 2015 in stead of the agreed 15th of every month. <br> on the 15 August i then received a call from WFS stating that my account is in arrears and that i will be reported as a slow payer. on 17 August the debit order run and the funds were collected from my account. several calls later from WFS which still claimed my account in arrears.<br> now come 15 September, no debit order collection on my account from WFS services, bank statements available as proof hereof. and again the calls started, account in arrears, report as a slow payer, and so it goes on and on. <br> Sumya Erspe at WFS gave me at least 5 different dates she claimed my account was not paid, every time she could not explain she choose another date. i requested her to send me a confirmation of our conversation via email - the call was then politely cut.<br> what next??