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Service Vehicle Soon message is telling you there is a fault, you need to get the car hooked up to a diagnostic machine so that the fault code can be read. The fault could be related to dpf hense the reason why the dpf cannot complete regeneration. It could be because the dpf is too full and can't regen normally, or there could be a fault with some other component relating to dpf such as temp sensor that is causing the issue. Long story short though is take it to someone that can read the stored fault codes.
Don't just keep running the car if the svs message is on and the dpf cannot regenerate as you will end up with much bigger problems.
Don't just keep running the car if the svs message is on and the dpf cannot regenerate as you will end up with much bigger problems.