Vodacom misleading online sales &customer service

I renew my vodacom data bundle online sales guy inform me I can get 3gig day and night owl after month enquire regarding night owl they inform me no only for open line but this was never said in any discussions with sales ,I decided to open it after been **** to they open it confirm a week before time yes it been done just to discover no not done phone customer care they plead the I don't know act .I did done with Fabian numerous email and customer care service unsuccessful , vodacom portal unable to access as customer care is solving the password and log in problem for 5months now what wonderful service .What to do should I insist to get what I was promise in original sales conversation?