Incorrect vibration damper installed

I took my vehicle to Steve's Auto Clinic early December 2021 to replace vibration damper. After this there was a strange sound and therefore took vehicle back a week later only for the mechanic to confirm the sound should not be there and he advised that 2 other parts are replaced (despite admitting that these 2 parts were checked and confirmed to be in good shape). Having spent the extra money to replace additional parts, the strange sound was still there and just got worse over the holiday. Early January 2022 I took my vehicle to the agents who advised that the vibration damper installed is not the same size as the original and hence causing a vibration. Again I forked out funds to replace the same vibration damper Steve's Auto Clinic replaced 3 weeks earlier. Luckily, this resolved the strange sound. I took the part back to Steve's Auto Clinic and asked for a refund as they sold me the incorrect part and had a chance to correct it after I took my vehicle back a second time, yet they wanted to replace other parts. They refused a refund and insist that there is nothing wrong with the their part (despite their mechanic admitting to the strange sound as described earlier). Will not recommend them.