I contact samsung and they tell me over chat:
You are now chatting with 'Mounika S'. The reference number for this chat is 4329996064.
Mounika S: Hi, thank you for reaching out to Samsung Technical Support. How may I assist you?
Stoyan Ivanov: hello i have s7 since 07-03-2016 i have scratches on home button around the frame what i should do ?
Mounika S: Just to confirm, are we connected on the chat?
Stoyan Ivanov: confirm
Mounika S: It could be inconvenient for you. Let me check what best I can do for you in this regard.
Mounika S: Shall I ask you a few questions to assist you better?
Stoyan Ivanov: yes
Mounika S: Where (country) did you purchase the phone?
Stoyan Ivanov: bulgaria
Mounika S: I am sorry to inform you that Samsung technical support department deals with technical troubleshooting for U.S. devices only and doesn't have information about non-U.S. devices. However, I will provide you with the international contact details.
Mounika S:
Store | Samsung
Mounika S: Please access the above link to reach your country support team for further assistance.
Stoyan Ivanov: yes i contacted them but they told me whether the problem is covered by warranty
Stoyan Ivanov: i have not receive clear respons
Mounika S:
They will bring the device in for evaluation, and the repair technician will determine if the cause of damage is due to defect or an external source. If a defect is found by external source, you will receive an email with the option to pay for repair. If the damage is caused by a defect, the device will be repaired under warranty
Stoyan Ivanov: ok thanks
Stoyan Ivanov: have a nice day
Mounika S: You are welcome.