Extremely poor service

I was due to fly from Gibraltar to London Heathrow on BA flight BA0491 on Saturday 26 September 2015 at 17h00.<br> <br> Due to a long queue at the border between Spain and Gibraltar I only arrived at the airport at 16h00 for my flight at 17h00. <br> <br> At about 16h50 while still standing in the queue, I alerted one of the staff at the airport that I was going to miss my flight to London if I wasn't assisted straight away. Upon my request, the lady at the check in counter said that check in already closed for my flight and she was unwilling to assist me. I explained that I had been standing in the queue for about an hour and could not miss my flight as I had a connecting flight to Johannesburg at 21h20. To my utter amazement, she said first there was nobody in the queue at 16h25 and then changed her story to they consulted all passengers on my flight that check in was closing.<br> <br> I managed to get on the flight but only with hand luggage and I had to leave my suitcase with the rest of my valuables behind in Gibraltar. The lady behind the counter also said she could not assist me to get my suitcase to South Africa.<br> <br> I have mailed BA on 27 September 2015 with the complaint and received no feedback.<br>