Terrible client service after issues with printer

We bought an Epson L565 printer from Incredible Connection at The Glen in Johannes burg, where we were promised that the printer would work perfectly for our needs, and that it wouldn't give us any hassles, should it however give us any trouble they would send it in and give us a 'loan machine' in the mean time. After a few months it started printing incorrectly (lines through images and text), when we took it to our local Incredible Connection we were told that they firstly don't give 'loan machines' but would send the printer in. This happens a few times ... After a few visits to the local Incredible Connection they told us that the printer just needs to be "re calibrated" and that we must do it ourselves, they even showed us how to do it. I have done as they have told me, however it has gotten to the point that I have to re-calibrate it every second week, which is not right. This is where Epson comes in, I called them to ask for their assistance and was told that its normal that I must re calibrate it, these printers do that. If it was normal, I should have had to do it since the start... I called numerous times and requested to speak to a manager, but they/he/she is always busy, and will call me back, I am still waiting for that to happen. I just want a realistic and permanent solution to the problem as my printer is still under guarantee.