Samsung Service Non-Existant

I have a Samsung S6 that rewuires a new battery. The service centres indicate a 3 week period and the phone has to be handed in as Samsung do not allow a battery to be purchased and delivered and the phone then be handed in. I have made 3 phone calls to the customer care service but they can only re-affirm Samsung policy. I can only warn anyone who wants to buy or select a Samsung phone on a contract, to make sure it works correctly because, if it does not there is no way you will be able to get Samsung to repair it. They are not capable of providing any service at all.