Worst excuse for repairing a device, trying to make a quick buck!!

I purchased a Samsung A02 for my 13yr old son in May this year, he happened to drop it & the screen had a slight crack a few days after having the phone, this phone has been working perfectly fine until 24th September 2021, where it wouldn't unlock at all, the buttons on the side wouldn't work. Same day I took it back to the MTN provider which I purchased it from & they sent it away for repairs, it happened to end up at this horrible, skimpy service provider who has no customer service tack. I had to call 2 weeks later to find out what is happening to the phone being repaired. I received a quote telling me the phone is no longer under warranty, its not covered for liquid damage, where that comes in, Im not sure & the screen needs to be replaced, how pathetic!!! When I questioned them about why the phone wasn't unlocking & why I'm being charged more than I actually PAID for the brand new device, with courier fees that didnt even match the quotes being sent to me, they just went quiet, a week later I emailed them again, still no response, seems their technicians aren't really clued up to what is actually the real fault of the phone so they just want to replace everyone's screens, it's now been 2 weeks since I have NOT heard from them, dont bother to check online about the job repair as that too doesn't work please DON'T ever send your device to be repaired by these fools.