Pest Magic Ultra Sonic Pest Repeller.... Waste of money

I bought pest magic ultra sonic pest repeller a Homemark product hoping that it would repel flies at my house. It's been four weeks now, nothing has changed infact I have more flies now. I have been calling their number as suggested if the product is not yielding positive results. However, people answering the call on the other end are so rude, irritated and unprofessional. I have been waiting for Sifiso to give me a call back regarding the product.

What a total waste of money.