Absurdly poor service from vodacom

Absolutely disappointed and appalled by the service I received from vodacom they have upgraded two of my lines via telephone firstly the information I received about the phones were incorrect I returned the phones the very minute I received it as it was a downgrade from the devices i had received sms's stating tgey had returned the phones and up to today have not received a call back with regards to my new devices. I had I called more the 10 times already and am told everytime it will be escalated but this never happend my premium has increased and deducted yet still do not have the devices in my possession. Absolutely ridiculous and I want to cancel all my lines and affiliations with vodacom whom I have been a loyal customer to for over 10 years to make matters worse every agent I speak has a different story