Thanks Kings12345 for your valuable advice on this matter. I did the rejection by email as per your advice. Today morning I called Cargiant for an update and an agent told me they have replaced the car with new parts but even after this knocking sound is still there. They had referred the car to SEAT to find the reason for engine knocking sound. Straightaway I said I want to speak to senior manager to get the refund but was not available. Cargiant called me just before and agreed to do a full refund. I'm very pleased with this. I thank kings12345 and conniff's for their valuable advice.

Thanks for the information. I kept saying to cargiant refund me the car price. But they say if it is only a major fault I have the option to request for a refund. otherwise they fix it and I have to accept it. Tomorrow they are going to tell me about the outcome of the repaire. I have no intention to accept it.

Thanks kings12345 for the advice. I paid by debit card so I believe chances are recovering from bank is less. They don't accept credit cards. Today cargiant recovery team picked the car. I'm waiting for their response. My intention is to return the car anyway. I also heard from friends, once the engine is stripped and repair done, this will impact the car's value.

I bought a car from Car giant four days ago. On the way to home I noticed a knocking kind of noise from the engine. I believed it's a minor problem but I immediately booked an appointment with a SEAT service center for an inspection. They confirmed engine sound was due to lack of service and it will take 5-8 hrs to strip the engine and find the problem. They said most probably new engine may required. They also showed me next service due to date and mileage on the service book had been tampered. Actually I didn't noticed or believed that it had altered at the time of purchase. Next service date altered to 07-06-2016 from 07-06-2015. We can see this clearly, it has been altered by pen. No service been carried out in 2015. Had I seen there was a missed service I wouldn't have bought the car. Now due to this lack of service, engine appear to have damaged. Only one service been done from new (06-2012). I called to Cargiant today to return the car for a full refund. They said they want to inspect the car and fix the fault. Recovery has been booked. I told them I was sold the car with tampered service book hence I need the full refund of the car regardless of type of the engine fault. They said they cannot take the responsibility of the tampered service book because that's how they received it from the previous car owner. I believe this so un-fare to sell a car like this. I'm wondering what are my rights in this case. Can I request for a full refund just based on tampered service log book ? Thanks for your advise in advance