Letter of Demand for Beauty Salon in Penang, Malaysia

I am seeking damages from a beauty salon which have caused Post Inflammatory Hyperpigmentation (PIH) due to a facial treatment done. I'm seeking damages for pain and suffering and cost of treatment. The accused have agreed to return the sum spent for the treatment which I have not yet collected. I have written my demand for compensation on Whatsapp but they have declined. Please contact me for more information, thank you. I can be reached [Removed by Freelancer.com]. I have pictures of the injuries on my face as well.