TO HELL WITH RAIN

I scheduled for a cancelation of a Sim with rain early December 2023, I was told I had to settle the balance end of Dec before they can cancel. It was not cancelled. I settle the Jan account, phoned them that's when it could be cancelled. Now, the installment for the previous account appears with the new account I have with rain & the telling me my account is "a use then pay later". How... how do I pay for an account end February that was cancelled end January. I requested to speak to the manager & they said he is not available.