I want my refund

Please stop hiring *********** staff... When I called in April for my upgrade I asked the agent I spoke to on the additional charge for data I'm not receiving and she said she will have it cancelled. I called again in July to enquire on why my bill is still high. The agent told me that I'm still being billed for data in not receiving and she said she would log a call for a refund and I would receive it within 7 to 21 days. I called again on the 15th of August to enquire why I'm still being billed for a service I requested cancellation on and was told it will also be refunded and a call is being logged once again and should follow up in 7 days. I called the call center yesterday to check on my refund. To my surprise, the agent said that a call was incorrectly logged and will fix it. I called this morning again, and I just couldn't believe what I was told. Again the agent yesterday logged the call incorrectly. So, basically, all I got was " sorry mam, I understand, it will be refunded in 7 working day"...that's all I'm hearing from agents who are ***********, blaming each other and rendering poor service for them to get a salary monthly. I want my money MTN...