LAM air travel warning

I holidayed in Mozambique with my family using LAM as booked by Mozambique Travel. We were supposed to catch a domestic flight from Inhambane to Vilanculos on 28 April (TM 2126), but due to circumstances beyond our control we were unable to do so and had to find our way to Vilanculos at an additional cost. <br> As a result of our non-use of the tickets from Inhambane to Vilanculos, our return flights home from Vilanculos to Johannesburg (via Inhambane) (TM 2124 and TM 2333) on 3 May, were suspended. We had thought our travel agent could have informed LAM that we had missed our domestic flight, but they had not done so. When we got to Vilanculos airport (early) on 3 May for our flight home, we were shocked to find out that our tickets had been \re-sold"as a result we had to get return flights from SAA at great additional expense. The agency absolved themselves of responsibility after our return claiming that they couldn't take up the refund on our behalf. Yet they could make the booking on our behalf...interesting ? I have tried unsuccessfully to get refunded from LAM "