I have received that kind of letter before. I felt angry at that moment as my maid use my home address for her personal use without my premission. So I was called to the company (a phone no. printed on the envelope) and tell them I'll going to terminate my maid and don't want to receive the letter again. I told them they can keep the account of my maid but don't use my address as the correspondence address. Then I gave my maid the letter but have not told her what I did. I'm happy no more letter from that company has recevied again.