Incorrect quotes everytime/Over charging

From as long as I can remember I seem to always have a problem with Chubb hiring *********** people. They send out people to quote with no knowledge of their systems and then the customer has to pay for their mistake.<br> In March 2014 I had Julie singh who quoted me incorrectly, that took numerous calls and emails to correct.<br> In October 2014 I has asked for a technician to move a passive as we installed blinds and it was in the way. They completed the Job in 90 mins but billed me for 3 hours. I made a note on the job card and did send a mail to the company and Called Neran who claimed the satellite tracking said they were at the premises for 3 hours. I explained that there was a supermarket and restaurant in the building so they could have been there but they still billed us for 3 hours. In December 2015 I got Duncan Slabbert to come out and quote to add 3 more passives a door contact and panic button to the extension of our offices and he quoted R2264.29. I then asked them to revise the quote to add 3 more passives which Rosh came out to quote and the quote went to R8221.75 because apparently Duncan made a mistake!!<br> I really dont see why the customer should pay for their mistakes!!!