the thing is that you can't just do a spell and then bam your 3rd eye is open. The spell probably might have helped, but its not opened yet.
Opening the third eye takes a lot of practise and control.
If you want more information feel free to give me a message but here's briefly the case.
You have 7 chakra, your third eye is your 6th chakra. Chakras are like energy gates along your body, the point is to open them.
In order to open your third eye successfully you need to open your other chakras first. Everyone is different and some people just naturally have chakras opened while other's may find that a specific chakra is a little harder to open. This is where the time and meditation takes place.
The goal is to clean and open all your chakras starting from the root chakra.
I just jumped online and did some quick searches on the internet, its not a bad place to start
or you can do more research into books as well.
Iso-tones.com Is a good place to get free isochronic tones, which aide you in meditations. There is ones for chakrahs and 3rd eye. Maybe that will help :). Headphones not required, but do help. Good luck