After couple months I changed the brush head and it started to make the more horrible voice. It is so loud and not doing ...

After 6 months use It started to make a weird voice. I continued to use it by thinking that's the brush head problem. After couple months I changed the brush head and it started to make the more horrible voice. It is so loud and not doing its brushing job at all. You can't imagine the loud noise it makes. I wish I can return or exchange it at least...but there's no more option for me and I don't know who to contact. Please offer an exchange for the poor quality of a $180 teeth brush..is it actually authentic????

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