Bad customer service

So I have various products with old mutual. I am very happy with them but I have a huge problem whereas they have very bad customer service which I'm experiencing. So 2 year ago I started a new job and my debit was due to go off but it bounced as I had no funds .Just 5 days into the next month I made an eft payment to not be in arrears. Back to the present Dat old mutual collection call me and say I'm in arrears. I contact them and tell them I'm up to date.The consultant gave me gsenquireries of old mutual email address to send the relevant documents. I send them the relevant documents with proof that I paid.They mail me back with and email I don't understand and they double debit me which as per consultant explained Just for one month only .The very next month they try to double debit me again. They have different departments that's dealing with this and none is helpfull at all because each one is telling a different story. I. So frustrated now because I'm trying to resolve thus for the last 3 months now to no avail.I call the call center I speak to an agent my call is cut of and they don't call back .No one is resolving my query. It's like every one I'm speaking to is giving me different story and they are clueless. I'm so frustrated as I have to deal with life and then the people I trust with life (Old Mutual) is messing up.