toyota call centre agent signs up deal *******ly!!

2 weeks ago I received a call from Toyota contact centre advising that I will need an additional service plan. I did advise the consultant, a lady, that I was in a meeting and she should contact my wife with any enquiries about the service plan as the vehicle that we have is under my name but it is my wife's car. upon contacting my wife, my wife did advise that the service plan that is in place is sufficient and we do not require another one. my monthly instalment has been successfully debited from my bank account and I have noticed that the instalment has increased. my wife has contacted management from Durban South Toyota enquiring the reason for the instalment increase. she was then told that the extra amount has been added due to the contact centre signing us up for the service plan. THIS IS *****!!!!!! as we have not given any consent for this. we have tried to resolve the issue by contacting the Toyota contact centre on ***, I was then given the consultants \direct number\" ***, first attempt the person answered and then hung up. my wife has attempted to contact the 011 number numerous times. the initial phone was from ***. I want my money from Toyota ASAP"