X takes his motor vehicle to Sporty Motors for a service. On his arrival, he is asked to sign a "job card" by the owner. X enquires why he is required to sign the "job card" and the owner explains to him that by signing he is authorising them to conduct the service on his car which will cost R10 000. He signs the "job card" without reading it. While servicing the car, the service manager finds faults on the car (unrelated to the service) and he proceeds to do these additional repairs for a further R8 000. X refuses to pay for the additional repairs and argues that he did not authorise such repairs. The owner of Sporty Motors argues that X is obliged to pay for the work done as the "job card" contains a contractual clause authorising Sporty Motors to do any repairs on the motor vehicle which they deem necessary without asking for the client's authorisation and the client becomes liable to pay for the repairs in terms of this clause. Advise X on whether he is contractually liable to pay Sporty Motors R8 000 for the additional repairs. Discuss fully and refer to case law in your