Terrifying and Disgusted experience ever

On the 16th April 2022, I have purchased a 125ml Dark & Lovely Straight and Shine Relaxer.The moment I started applying this product my scalp started burning in less than 5 minutes I then immediately rinsed my hair while rinising i noticed long strands of my hair falled out from my roots, the water in the basin was covered with hair and when I checked the mirror I immediately saw the bald sections where my hair fell out.Few days latest I saw the add that their was a fault in the batch they produced and sent to the shelves without checking!!!!!My scalp was burned, I am sitting with Scabs on my scalp and and half Bald. Dark & Lovely wants to reimburse me with a R30 voucher which does not cover the damage and pain I have to endure never mind the Salon fees to now cut my hair.This services is totally unprofessional to say the least!