Need urgent help from exchange manager

I have been dealing with Samsung now for just under 3 months trying to get and exchange for my device that have been repaired 3 times already for the same thing I’ve been calling Samsung and the exchange department or managers are never available to help the customer service department is useless and always say nobody available to help or nobody’s answering I need to get my phone exchange sorted the service I received so far is horrible and seems like Samsung are not willing to help phone still has 1 year left on warranty claim has been approved already need a direct exchange as store credit is not working