Disappointed customer...

I purchased vodacom contract phones through nashua mobile more than 5 yrs ago and I had a very smooth and satisfactory relationship with nashua mobile until my account was moved to vodacom,.I was paying R99 pm with nashua mobile for one of my phones but after moving to vadacom they debited 149 from my account without even consulting with me first and I let it slide as the contract was about expire . Now I decided to upgrade one of my phones and i was told the upgrade fee will be debited end of July with my next invoice but to my surprise I keep getting this annoying automated voice message on all my phones 2 to 3 times daily to pay an amount of R150, and when call the helpline to try and stop the message i'm told it's an upgrade fee which i'm supposed to go pay by hand or all my phones will be suspended if don't pay. I never had this problems with nashua mobile all the upgrade fee were debited with my invoice, the service I received since my account is handled by vodacom is shockingly terrible and i will surely be cancelling my other 2 contracts when they expire in October...