J R's Exhausts Unclaimed

done a branch on a honda civic. after getting the car back from Jr Exhaust ontdekkers the car wasnt getting enough air causing it to lose power and choke. took the car back to him after 5 minutes after collecting car but he said everything is fine and honda needs to reset settings because of the branch. Took it to honda they reset everthing but the problem was still there. had to replace the oxegen sensor. dont know if he damaged it or swapped it but the car didnt have this problem before it went to him. he doesnt want to take responsibility for the sensor and says he just moved it. sensor costs R3000.00