irritated yet again

bc back in September I bought a pair of earbuds for about $30 and they are a terrific pair of earbuds, prob the best I've ever had, but the problem is since the beginning the right earbud hasn't charged properly. it
would charge but i had to mess around w it in the case to get it to charge. I was gonna exchange it right away but I somehow misplaced or threw out the receipt so I was basically stuck w this exact one. but it
did technically work so I was like okay whatever.
well here I am about 3-4 months later, and the case decided to just completely stop charging my right earbud. I tried cleaning it w 91% rubbing alcohol and it did nothing. tried messing around w it a bunch, did nothing. tried going on the manufacturer's website and they will only honor the warranty if I have a proof of purchase, which I don't bc I threw out the recept somehow. tried sending them a message and they sent me some automated bs about filing a warranty claim which I CANT EVEN DO.
so basically I have to go back to thr store tomorrow and waste another $30 and get a brand new pair, this time I will be sure I don't throw out the recept bc I'm not dealing with this again.