Stopped turning on

I purchased this charger pack in March for my husband. He commutes for work on public transit, so the pack was intended for "emergency use" meaning he did not use the pack daily. The pack was charged and utilized a handful of times. The pack has now stopped turning on and cannot be used. I attempted to contact the company, Tronsmart, but the phone number does not seem to be a legitimate business phone. It does not ring. I have attempted to now contact the company via email. I will see if I receive a response. I am disappointed how short lived this product was.

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