Exauberant pricing

I have trellidor on every window and door in my house I have a expanding trellidor door on my patio area and have decided to close this area off with a glass door unfortunately the trellidor is a bit in the way now so i emailed them to get a quote to move the trellidor 8cm foward from its existing position to accomidate the new door. This would literally require removing 12 bolts, moving the trellidor 8cm foward and drilling 12 new holes and then reinsurting the bolts. This is a easy job and i could do it myself would take 20mins max to do, but would void the warranty if i were to do it. So a week later i finaly get a responce after having sent a follow up email. I get a call from a lady telling me the call out fee would be R570 and then i would still need to pay the installers extra money to have it installed. (Which she could not tell me the price of and that it had to be in cash before they did anything)this was strange as all my other payments had been via eft.i then asked how long it would take to install, the lady then called someone by her and after some back and forth a time of 1h30 minutes was given (please note the hole install of all my trellidors did not even take that long) i asked to have a total figure as i would need to draw the cash before hand. Again some back and forth with someone on that side, she eventualy told me she will phone me back in 5 minutes. 1h and 5 minutes later i get a call saying the price was R1130 (or there abouts) this seems very steep as all it is is removing 12 bolts and some drilling. (Also this is almost the price of my kitchen trellidor which was measure build, supply and install. ) i then asked for her to email me some paper work (something about it can only be done in the morning.) we then hung up. 15 minutes later she calls again saying she has spoken to someone and the lowest price they can give me is R1250.00. I was utterly shocked as it was now R120 more expensive than before. How is this possible are they randomly making up figures as they go along? Were it not for the stupid warranty i would not have had this hassel.