Do not return calls or keep appointments

I have been trying to purchase a pool cover since December. They told me it was end of the year and not doing any more business until they open in Jan, and they put my name on the board to contact when they opened in Jan. 15 Jan I then called them, as no-one had contacted me. I was told a sales person would contact me.. Nothing. Today I emailed and phoned, they promised to be at my house today at 4.30. Now 6pm, I guess I wasted my time waiting. If this is pre-sales service, what is the after sales like.