Accounts department only gives empty promises

So after i had to write a review, the issue regarding the faulty unit has been resolved, but i still get continuous phone calls from the accounts department regarding the payments i reversed due to me not having an active unit and was awaiting the repair. during my wait and even after the faulty unit was removed and a new unit was installed i was contacted and everytime having to explain to every agent the same story over and over and hearing the same excuse that they will escalate the matter to a manager, whom it seems does not care to resolve the issue or simply the agents aren't really escalating the matter to the manager. I was told on Saturday that i would have an answer within 48hours and still nothing. I am also not going to pay for a unit in my vehicle for a full 6 weeks if the unit was disconnected due to a fault with the unit for close to 3 weeks of this time.