Hirsch's selling faulty item and then not wanting to accept the return or assist!

We purchased a Bosch Microwave from Hirsch's on the 14th of December 2022. Within 2 days of purchasing the item, we took it back to Hirsch's and told them that the microwave is not working and not heating the food up. They could not assist us and they told us in line with CPA they need to protect us which doesnt even make sense?! They then also told us that they want to charge us 30% surcharge if we wanted to return the unit.We have been in contact with Bosch and they have told us that as per CPA, we have 7 days to give the item back to Hirsch's for a full refund. We have tried speaking to the manager (Steff) and sales person (Deslin) at Hirsch and we have been ignored. They are not answering our messages. So now we are stuck with a microwave that we bought for Christmas and now we cant use it and we keep being sent around in circles with no one helping us? The after sale service is shocking! When we took the microwave in to Hirsch they tested it and said its fine, we got home, took a video which we sent to them to show them it is not heating the food up and the stop/start button also not working well and they refused to give us a refund because of CPA??? we took it back within 2 days of purchasing the item and had to come home with the same item that is not working?? We are now stuck with a microwave that doesn’t work, I am busy getting very frustrated with this whole situation. We buy an item trusting it works, and then it doesn’t and then we are not able to return it either? This is not in line with the Customer protection act at all!!!