Trainline is the WORST please avoid using this service

This is a bad service and should be shut down. If you are lucky enough to buy tickets and travel with no issues you probably think Trainline is ok. Should there be a problem then you will see their ugly money grabbing side.
Customer Service is incredibly unhelpful when trying to get a refund for trains that were cancelled. There is no option to change bought tickets to another day. There is no option to correct if you make a mistake booking eg enter wrong date - your money goes and nobody will ever help.
For starters, it's hard enough to find out how to contact them and then when you do finally find the live chat, they do not answer your questions. Really unhappy and won't be using Trainline to book tickets again. Southern Rail makes it much easier to get refunds for cancelled trains, they only request photos online with a cut from corner to corner but Trainline request you to post the tickets to their office.
Why have been allowed to trade in this manner. Even the reply to this will be an automatic computer generated response