I have been confused about them for a long time

I have been confused about them for a long time

I registered on semalt a year back accidentally and started getting calls from them and many emails to which I requested them to remove me from the database which they did and the calls stopped.
I was curious about them because of course I had a website and I was looking for a decent SEO company as I have been deceived many times.
They had a good option of trial but at 0.99$ I wasn't sure how they claim to deliver results as the companies I paid to couldn't show me anything in thousands dollars.