I bought an Anker 5 port USB charger and one of the port died after just 1 month of infrequent use. Their products are very well polished but their QC is bad as

I bought an Anker 5 port USB charger and one of the port died after just 1 month of infrequent use. Their products are very well polished but their QC is bad as you can find so many similar reviews in Amazon. They refused to replace my unit as it was sold by: Amazon Export Sales LLC, according to them which is not official reseller.