Overcharging with no refund

<p>Since December 2016 Telkom overcharged my account with R229 and they agreed they've made a mistake and up to date they have not refunded back my money. i've been calling them several times with no assistance at all, as they keep on saying the credit will apprear on the next statement since then. all the managers non of them can help Adrian, Nqobile and Lepoia. what else should i do to get back my money?</p>