Reluctance to give back deposit seems to be the order of the day

I have been trying to get back my Eskom Deposit since March this year and have had a total of 2 responses the whole time. Absolute and total silence since I have sent them all the documentation they needed. It seems that they are trying to hang onto every cent they have received from law abiding customers, yet to squander it elsewhere under dubious circumstances. This is beyong a joke. If they expect me to go away, then they have another thing coming!

Dear Eskom - Cough up the deposit you are now *********ly holding!