Teljoy gives me no joy

I rented a washing machine through Teljoy three years ago, the last year I've been having problems with my washing machine and they've come out about five times to repair it.... They've been very good with that and never had issues in doing it. My last call for repairs I asked the lady when my lease was coming to an end, she said she couldn't see exactly when it was but it's probably May or June 2017. So I thought to rather play it safe and let it continue until June 2017 then cancel my stop order. So July comes, I get an email from collections to say I'm in arrears, I couldn't understand why, so I asked them to please send me a statement of my account from inception until date so that I can see where my arrears came from....I didn't hear back from them, a month later, I get another email from another consultant, my arrears has doubled - with a recent statement! I noticed arrears is for July and August. Why??? So I responded back to the consultant, he advised me that my lease actually ended in July and they still required payment for July and because I didn't pay them in July, they added an extra installment to my arrears. Can they actually do this?? Arrear interest I can understand, but adding another installment?? *******... Especially since I had asked them in July already to clarify the arrears, with no response!! No offer to assist in resolving the matter, just that you're in arrears and you must pay. Today I get another email, quite a rude one I thought, and still no call from the manager as requested in my previous email sent a week ago... Their service throughout the period is good, but when it's time to cut ties, they seem to find it difficult to let go and still want to charge you over and over again... I'm feeling very frustrated as this could have been sorted in July had they contacted me back and had they sent me an email with a statement from inception to date as requested. They have to have some sort of records... Surely??? So to end, I still haven't received my statement and I still haven't had a call from management to sort this out, and I'm being charged double!! Probably next month triple!!