Vodacom charges double and contradicts their own t&c's

<p>I upgraded recently via vodacom's online service, when i received the usual sms that you are eligible to upgrade ....my old contract's expiry is 15 apr '17 and then my new contract should kick in right?!... wrong i was just billed for both and upon phoning call centre...trying to explain that never ever have i paid double when upgrading within my upgrade grace period...the consultant basically told me i am wrong...it has never worked like that....i mean really???? *** is point of upgrading in the upgrade period then....so now i want vodacom to explain why i am charged for both instead of the new upgrade just kicking in after 15 apr as it always use to work.....#not happy at all ....now i undestand why everyone complains about vodacom's service.....</p>