Pathetic customer service from your representatives

I purchased a Russell Hobbs microwave from Game last year September. . Unfortunately, the microwave has recently stopped working properly. Upon returning it, the manager Silvia was very rude it's as if she's doing as a favour I explained to them that I was given a demo microwave n the sales lady said if I have any issues I should bring it back since I have a one year garuntee I was also informed yesterday that it is in fact a garuntee so when asked for another one they said oh no it's a warranty and that they have to book it in mind you which is 21 days, for the next 21 days I have no microwave n they say there's nothing they can do.. Today I receive a message saying it's ready for collection I was on my way to the store only for them to call n say it was a mistake.. I was informed at the time of purchase that I can bring in at anytime of the one year n get a return and register for another year warranty. It seems like the game staff need to be trained because they seem lost.. As a customer, I am in need of urgent assistance I need the microwave to be returned or sorted within this week what am I gonna do are they gonna let me come to they home to heat my stuff for my kids??