Wrong package

I took out a cellphone contract with Vidacom earlier this year and our initial agreement was i will pay a certaum amount for 24 months which i was ok with. Around October ine of their consultant called me and said to me that they can see that i am not using my SMSs so he said to me they with take the sms and offered more minutes instate and furthermore said to me my installment wikl be reduced to my suprice now the installment went up and now the debit is bouncing back because i don't have that kind of money. When i ask the to put back to my old package they nit coming back to me thus yhe ref number they gave me this ref number rco154659