Waiting more than 3 months for repairs

My oven's glass door burst in September/October I notified OK Furniture and the manager told me that they will arrange to pick it up. During December i went to their store and she said they couldn't find my house, note that this is the very same house they delivered the stove to. So she said that she will arrange someone to collect it on 4 January but the company who does the repairs only open on the 15th, so I asked her what are they gonna do with my stove for 2 weeks? put it in storage while I could have used it? She then realized that she didn't think and we arranged for the 14th. They came today only, 2 February...but didn't take it because the gas bottle was not un*****ed because I don't un***** the gas bottle daily with the hope that they will come, she only called me this morning notifying me that they are on their way. These people are absolutely worthless. I wonder how long I will wait for my oven door to be fixed when they eventually collected the stove. I will probably have another negative report in due time.