What would you do if a company sell you products and don't care if it works afterward?

I am feeling so upset! This company didn't want to hear me saying any tingg. They say if you need support email them but they don't reply you, all the replis were computer generated. It was not a real person answering your questions.

On the 1st of March I registered a domain name with them but they fail to email me the registration details that they said they had at the time of registration. I had the record but it didn't work. What's funny was that the answer to my mum's Maiden name was said incorrectt-how could I get that wrong?!. I asked for their help to send me those details but they didn't want to do it straight forward. they send me links instead and I had to follow step 1-5. and I have to wait for 5 days for the result. If still nothing happens, repeat step 4 and the processroce goes on if nothing happens. I feel so angry! I send them a few emails in the first two month but only got a few links that didn't help much. then I send them 100 emails and got a little better link but which didn't really help either as I had to wait for 5 days for the result, and then I send them another 100 mails. and some anonymous person send a line to say, get a life and start reading instructions and they are going to just ignore me. What can I do?