Vodacom *****ing data

I have an active data bundle with 310mb data that expires 01/11/2017. Last night I purchased a new data bundle of 300mb that expires on 28/11/2017. Now my data usage is being deducted from the new data bundle that expires end November and not the active bundle that expires 1 Nov. So vodacom is *****ing the 310mb remaining that will expire. What steps can I take as vodacom gives no service