complaints about return and customer service

This has been an on going situation, since March as I had a faulty microwave and returned it back to the store to be fixed. I was told that I do not need to pay for the repair price or given a quotation, and that was one of their representative Micaela (Tokai branch), because if I was suppose to pay they were suppose to send me a quotation a long time ago, but because she told me this has been fixed and no payment needs to be made. I then waited for the microwave to be fixed until I received a call from her in July to say I can take from the store as it is now fixed, but when my sister went to the store, the microwave wasn't fixed. We then waited from that month for the microwave to be fixed. I have been calling them numerous times, but nothing about quotation or that we need to pay for the microwave, but that the microwave will be fixed and now it is November, only on 20 November 2020 that we need to pay for the fault that it is infested, of which that wasn't the problem in the first place. I have been promised so many call backs but no one got back to me as I have been calling and when I spoke to the Manager she dropped the call on me whilst I was speaking of which I find that very rude and unprofessional. Their customer service is atrocious and appalling.