8.ta recharge voucher

Bought a recharge voucher from a store for R140.00 on the 02 January 2018, when i try to recharge, it say MMI number invalid, called Telkom, the same day and gave all details on the 02 Jan, they said they will escalate the matter and the voucher will be recharged within 24 hours, to date i am still not recharged and have been calling everyday since then, speaking to different agents who all give a different response to the same query, the last one i spoke to said, there is no turn around time, so as a customer what does Telkom suggest i do?