Polokwane SPCA Nedbank Account not being released

We have been trying since September to get signatories changed on the bank account. Now that we have changed them, Nedbank is 'processing' the resignations of the other signatories. We have been asking for weeks now to get this sorted out and it falls on deaf ears and now the power has been cut at the charity shop as we cannot pay accounts as we cannot access the banking.