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Once you are in the Debt Review process and keep up with the monthly repayments, your car is safe from repossession.
Your creditors only being paid from the third or fourth month is how the program works and is legally set up that way. Your creditors have agreed to the terms so you should not be concerned.
If you exit your Debt Review program before receiving your Clearance Certificate then your creditors will have legal ground to repossess your vehicle. Rather complete the program.
It might be a good idea to call your Debt Counsellor to discuss your concerns before making a decision whether to stay or leave the program.