Poor customer service & poor communication

It has been 3 months waiting for a glass with no communication & everytime I call them they keep telling me about back order, how can a glass be on back order? Then on the 11th on May I decided to give them a push that when I received a call telling me the glass has arrived but when I went there on the 17th May it was a wrong glass & I was told they'll call me on later to let me know what was the ETA but no call received from & 22nd May I called them again they're telling me they're waiting on their supplier. Can't they just give me the money & go fit the glass at glassfit coz honestly you guys are real failing.