Unacceptable/Bad Service

Not happy with your service, I have a rental with teljoy for less than a year now, they insisted on going the debit order route with this rental reluctantly I agreed to this because I had bad experiences with debit orders in the past. Everything went well until the end of December when I got an SMS & email stating that I was handed over to collection for debit orders not going off( fund was available in this account for the 3 months they claimed I missed). I then mailed them to call me back as this was confusing to me but no one called back, I left this as I was the least of my worries at this time. Yesterday I received a call from MJB Collections Agency wanting to know when I'm going to make payment, this is completely unacceptable because they want me to pay up the arrears which was not my fault. Posting here was my last resort as the agent I was dealing with was doing her job & insisted on the money being paid (which I currently don't have seeing that its Januworry). Teljoy pls get back to me & don't tell me I need to pay up arrears come up with another suggestion that's not going to leave me out of pocket due to your negligence. Also a friend referred me to you guys which I some how regret as they & another member of the family experienced the same thing over the past 3 month I see a trend here.