MUNICIPALITY REFUSING TO REFUND DEPOSIT

I attempted completing their online forms to claim back my electricity deposit but their system kept failing. After being kept on hold for half an hour on the phone i eventually whatsapped them and they gave me an email address to email them the forms. They then forwarded the forms internally. I have now been waiting 13 months for my electricity deposit to be refunded to me. I email them almost weekly , mostly to be ignored. I am never able to email the relevant department directly. I am beyond furiius. I owe them no money and there is no logical reason for my deposit to be withheld from me. This is ****************.