Ahoy! Sorry to hear it didn't go well - if you send us across some photos and as much information as you can about what went wrong to support@pimoroni.com we'll do our best to help.
“Price is a bit steep for a few bits of plastic, but its also not crazy expensive. Managed to do 2 of the male headers. To use it work along the top bracket and hit it medium hard repeatedly, dont just wallop it with a single hit and expect it to be in. Not sure how long this thing will last though ?”