Irritated by you service

I am very much annoyed with cartrack and their client services. I have specifically asked to be refunded for their own miss selling. I have long waited for feedback from Mpho who is in fact the service manager, he told me he will be sending me an invoice within 7 days, this was on the 26th of March I'm still waiting. Today I called in to find out what's the delay we'll I was told that my credit note has been prepared, like how long does it take to approve an amount of R140 and odd cents? Clearly clients concerns are not a priority and you ask yourself why are you even continuing with such a pathetic service, You mislead clients and only when **** hits the fan you want to outline your process I'm utterly disgusted and feel very undermined to say the least!