Bad service

Well my experience with Pioneer Debt Solutions has just gone from bad to worse. In 2016 I signed their contract to reduce all my installments, two accounts were never reduced which was Jet account and ABSA credit card (avios) they never bothered to communicate such with me and I kept on receiving statements showing that the amount or the balance is decreasing until noticed when I wanted to settle all my accounts that these two accounts were not being paid accordingly. Funny enough I decided to settle them however in August they debited my account after having settled all accounts and this was communicated with them. I requested for a refund which they promised that it will only take 14 days to date I have not received my money. It has been 4 months full still trying to get my money back. I'm not sure what kind of service is PDS is really providing to its customers if a simple thing like refunding a client would take 4 months and yet they do not forget to debit clients. I need my money