Pestering, but of no help

Having recently experienced dire financial difficulties, which I advised FNB of, but never received any reply, I am now in a position to settle arrears, as indeed I have done. I am, however, unable to make any payments into my revolving facility, either externally from another bank, or by way of transfers from other FNB accounts on their banking app. I live in a rural area with poor or no cell reception and have tried several channels for assistance. E-mail is of no use, and neither is FNB's secure chat feature, with conflicting messages from different consultants, no use. Even an official complaint, via the FNB website, made on Friday 8 September 2023, remains unanswered. In the meantime they keep on pestering me with messages regarding the arrears on the overdraft, but I am unable to do anything about this, as much as I would like to.