Plugin doesn’t keep the config and support is weak

I tried to get support because:
– upload after 35logos (10kb each) stopped, worst: it lets you add but when you save you lose all details and changes.
– Grid display settings: same thing. you save and it doesn’t keep the saving.

but the worst is that after 10 days I only got 2 emails: sorry we are busy, and try to change this PHP param. Done but didn’t work.

I paid and been left there with a broken project and a not happy client