Russell Hobbs Microwave to be replaced

I purchased a Defy Fridge and Russell Hobbs Microwave from Game129 Tableview Cape Town on the 09th of June 2020.When i plugged the microwave in at home the plate did not turn but it did go on. I returned the Microwave and it was replaced with a new one. Now the replaced microwave is no longer heating anything.Not even 8 months and i have to return a brand new Russell Hobbs microwave to be repaired and not replaced according to the sales consultant. I was told that because it was replaced the 1st time it will not be replaced again?

I need to understand why i will have to wait 3 weeks if not longer for a microwave to be repaired instead of being replaced. I initially bought a defective Microwave in the 1st place that was not my fault to begin with. Now that the microwave no longer heats up I have to get it repaired by Game.

This is unacceptable.I need answers please?