Bests & Worsts Reviews from Amazon

I bought this phone for my husband for his birthday- the speaker is so low that you can barely listen and the battery started to warm up after using for 2 months. I contacted amazon and they connected me to One Plus. After two 40 minute LONG CALLS, the One plus customer rep denies to replace the NEW phone since I bought it on AMAZON which is selling PRIME SELLING PARTNER. They denied the replacement of new phone, suggested that they will repair with no future guarantee. My husband has had One plus for 5 years and this is how to they treat there loyal customer. The amazon representative was very nice she tried to help. THERE IS NO WHERE ONE PLUS MENTIONED THAT MANUFACTURE WARRANTY IS DIFFERENT WHEN YOU BUY FROM AMAZON - VERY DISAPPOINTED