FNB and GLA making life hard

All FNB accounts handed over to Groenewald Lubbe and Associates don't decrease. I had an overdraft due to prolonged unemployment it went into arrears. In 2022 when I resumed working, I had an arrangement of R500 with GLA and I increased it to R1000. The owing amount was around R21 370. after payments of over R15 000 I still owe R14 071. Can I pay directly with FNB as GLA is harrassing me monthly before payment is due and the amount owed keeps increasing