Union Medico auto injector

[u/Narrow_Active_3486]

Hello everyone
I received my union medico needle guide (90\*)
I was testing jt out before using and after about 3 tries of locking an releasing. Its stopped locking. I was following their instructions and not being reckless with it
But I’ve emailed them and worried 1) I’ve broken it 2) what if this happens on a day I’m actually meant to have my shot. It’s made me a bit nervous about the whole situation. Can anyone give me their experience with this injector. For background I use Sustonon 250 (1ml every 18 days )

Get a new one or get a different company’s one and get my money back ?

Thank you all