Samsung is attempting to de***** me

The harddrive to my notebook, which was under warranty crashed and i sent it in for repairs, the model name was written incorrectly by P&G Benoni and instead of just repairing the harddrive, the servicing technician - who works for Samsung, took the opportunity to downgrade the laptop, I don't know why. I sent it back when i noticed this- the technician then put in other parts(not my parts) and sent it back. It was still faulty, and i sent it back a third time, but now samsung are saying these parts have water damage(notice that these aren't my original parts and these damages are suddenly being noticed on the third inspection) and they say due to this my warranty has been voided, but since they're nice and its their fault they'll pay for some of the repair costs on it. Sylvester -from samsung, refused to give me the details of the compliance body that governs them and they gave me this feedback in a cheap ***ardly email.