Bad response on complaint

I lodged an complaint against Vodacom for triple billing me in one month. Although they had to take 2 payments, they proceded to take 3 payments. Hello Peter allowed me to complain amd Vodacom responded to follow up the next day, They contacted me 3 days later and made all sorts of promises, including that the funds will be back in my account by Wednesday 20 Jan 16, which is tommorrow. This morning of 19 January however, I get a message that the funds will now only be back in my account in 7 to 14 \working days"from today. This is unacceptable"