Lewis Poor management

I finished paying my lewis account in 2015 around February or March,which i never even missed a payment since September 2014 when i opened it,since i settled i have been receiving messages that my installment is due therefore i must call my branch..i relocated so i went to Somerset lewis store and they called on my behalf trying to sort out the problem and saldanha branch said it will be sorted,now its 2016 and still receiving those due installments,i personally called saldanha branch and they did see on their system that i settled my account and that lady Marikah said she will call head office sort it out and get back to me,its been almost 2 weeks and i just received another sms..apparently im in arreas from R1 to R200 then now its over a R1000 but i settled my account and never bought anything else even asked them to close that account..its this is not sorted out im involving my lawyers im sick and tired of this and dnt want anything to do with lewis anymore ever!