******ED EVERY MONTH BY TELKOM.!!!!!!!!!!!!!!!

hello i took a router contract of 6GB ON February 2018,and i have been paying R150 monthly,i took the contract at gateway branch ,KwaZulu-Natal,the guy who assisted me was Nqobile Delwa ,the data dont even last a day, and now when i connect it says no Data but every month im paying, i went to the store several time for help but no help, NO DATA BUT EVERY MONTH IT BEEN DEDUCTED ON MY ACCOUNT. please help this is *******.