TELKOM MOBILE BAD CUSTOMER SERVICE

Why is it so hard to get proof of purchase if you signed up online with Telkom? I signed up in late 2019 and now my mobile is giving issues where it doesn't want to charge anymore. I called Telkom customer care 5 TIMES!!!!!! Only to be told to phone the next number and the next number, NO-ONE seems to know how to help me. All I need to book my device in is proof of purchase, Samsung refuses to accept my Tax Monthly invoice. WHY IS IT SO DIFFICULT!?!?!?!?!?!?!?!?!?!?!?!? I've seen a lot of people experiencing the same problem