Samsung Galaxy A3 vibrate loop cant access recovery

Hello, I think I have bricked my phone.
It is a Samsung Galaxy A3 SM-A300M
I used the TWRP Manager app and I think I loaded the wrong recovery image for my phone.
The app said it installed the recovery succesfully then asked to reboot into recovery. I accepted and the phone rebooted but never entered recovery, it just vibrates every 2 seconds.

Now it wont show anything on the screen, just vibrates every 2 seconds

I've tried the following with no success:

1) holding volume up + power + home
2) holding volume down + power + home
3) holding volume up + power
4) holding volume down + power
5) holding power button for more than 2 minutes

In every case it just keeps vibrating

Please consider that the Samsung Galaxy A3 is a unibody model, so I can't take out the battery.

What would you say are my options?

Thanks in advance!!

P.S.: I would post this on the Samsung A series sub forum, but since I'm a new user can only post here.