Breach of agreement

As per legal agreement that I have made with Norman Bisset and Associates and consultation with a Fasta consultant I am to be debited R150 only from Norman Bisset and associates. The agreement that this amount would be the only transaction that I will be paying as my account is handed over to a legal company for collection. Yet Fasta has now debited from my account R350. This is in complete breach of agreement that was made. I am an unemployed individual who is still making payment and yet this has been done. Completely pathetic and disregard to what a legal agreement is.