3 weeks ago , I had my car replaced with new schocks and they took about 3 hrs to replace them, only to find out that the schocks are not the correct size for my car

3 weeks ago , I had my car replaced with new schocks and they took about 3 hrs to replace them, only to find out that the schocks are not the correct size for my car. Instead of MACHANIC to say the schocks are still incorrect, he hammer the schocks and damage the schocks. So now I can’t return the schocks to my refund. They promised to help but they are blaming me for buying and bringing incorrect schocks.