Bad service from Travelstart

I am a frequent traveller to foreign countries. I made use frequently of the services of Travelstart local. I uses there services 2 to foreign countries. The first time I missed a flight because of a time factor that they didn't incorporated into my iterenerary. I had to change from airports in Istanbul. It caused me to miss a flight, bought another ticket to my destination out of my own pocket. What I didn't knew, the chain of travelling were broken by that, ending up on the return, all flights on my name were cancelled. Also the flights were fully booked. Also did my Visa expire later that day. Again I had to buy tickets out of my own pocket, and being put on a wait, should there be a cancellation, which indeed happened, allowing me a seat. Then I booked a second tour through them. I needed to change dates once in my destined place. I sent a email. They say it is no problem, I pay a penalty, etc etc. I gave them the dates, they send a proforma, to the wrong end destination. Now I try to sort that out. Not their 'urgent' or normal office groups seems to be able to sort it out. I can not go into their website, because they put some cloud security system in place, so I cannot manage my system. They keep sending me a message that I need to confirm that I will take the flight. So I decide to do that and sort my own travel needs out once in SA. It seems to be a automated message because I do not get any response from them. In the mean time am I sitting in front of a computer through the night, 3 hours time difference, 6 hours left before the flight takes place, I could not pay because I do not get a invoice or confirmation from them. This was the very, very last time. Even locally I will not use them again. In two weeks time I will travel again abroad, I joined Air France club, let us hope. I am not sure if even 1 start is good enough