Bad Service , Response and Attitude

I took out a new contract for a samsung note 5 on the 24 of November and returned it on the 30 because it had dust inside the front camera they told me it had to go for assessment first.On the 5 of November i went back to the store as i got no response.My phone was back but was told that no faults were found.I then took out pictures of the staff member at the store and told them send it back with the pictures as im not accepting the phone back.I then looked at pictures that was taken at samsung and found that it was the back camera they were looking at and not the front .My phone was sent back and up till today the manager from the store has no response for me. I went into another store to get some information on the phone and they have told me that the manager from that store booked your phone in to be repaired and not a OBF .I then got a call from the manager of the store today the 21 of December after calling a number of times, saying that samsung is still busy with the phone it will be a repair and once i get it back i need to say its freezing and giveing other problems and then they will give me a new one.but i gave the phone in before 7days and didnt accept it on the 5th dec