Complaint: Data I can not use.

I Bought data's on Monday 1st I can't seem to use them. I made call to Mtn Tuesday and I explained to the lady, she told me those data's are for router and she can't comment any further because I used banking app when I bought them. Made another call a lady by the name of Charity tried to help she understood my frustration and she told me she will escalate the matter to her team leader I should wait for a call, until now nothing has been done by the way I went to a branch to enquire about this and they said there's nothing showing that the data's are for a router. I left that branch very unhappy, I made another call I was told to switch my cell off and on again I should be able to use them but still I can't. Three reasons I was told they are for a Router, Wrong plan and Because I bought them via Cellphone app. Can you assist me please.