POOR CUSTOMER SERVICE

Service from mtn customer care line is non existence. They refuse to transfer you to the relevant department and keep on telling you that the matter has been assigned to the department. I app**** for an upgrade in April and I was promised 20 gig promotional data. I still have not received my data and they keep on saying that my matter has been assigned to their billing department. I have been enquiring since May with no help from the customer care . Please improve your services