I have trouble using my sleepbuds. different troubles. from not being able to download from the library to not finding the right bud. I bought the sleepbuds around 3 months ago from Doha. Bose has no store or branch in Iran. How can I change my product for a new one? because I've tried all the suggestions and solutions mentioned here, but no result. If I happen to go to Doha again, would they change it for me? what is needed? the receipt? could you please give me a hint?