My suggestion, based on a lot of professional experience in dealing with problems (as a lawyer): write a brief, and balanced letter to the President and a few other top executives at the company, explaining that you bought the speakers used, they were damaged in shipping, that the seller or carrier's insurance is covering, but that having gone to the trouble and expense of crating and shipping them to the company 5 weeks ago (or whenever), you have yet to get the necessary estimate. That you've called a number of times, and you need their help to get this sorted out quickly.
I presume you are going to have the company repair the speaker using the insurance money? You might want to ask them what the realistic timetable for that is, once you can have the insurance payment sent to them (in other words, encourage them to get you queued up for the repair quickly once the estimate is rendered and the payment for repair is made).
I presume you are going to have the company repair the speaker using the insurance money? You might want to ask them what the realistic timetable for that is, once you can have the insurance payment sent to them (in other words, encourage them to get you queued up for the repair quickly once the estimate is rendered and the payment for repair is made).