Damage caused by Huawei to my phone

Sent my phone for screen repairs at Huawei Melrose Arch on the 25th May 2021.They repaired it within hours and upon collecting it I noticed that they had fidgeted with the charging point when they were doing the repairs. Phone came back not charging as fast as it was with the huawei quick charger and yesterday it refused to charge. Took it in today since it's still under 90 days repair warranty to be told that I have to pay another R1300 for the charging point that they damaged to be repaired. Thuso guy that was assisting me at Melrose refused to go all out in proving that they didnt damage my phone upon repairs less that 2 months ago. I cant pay another R1300