Poor service Cell C

Apparently the cell c shop attendant in Galleria told me my phone was due for upgrade and I took an upgrade then unknowingly this attendant network blocked my old phone(iPhone 6s) and when I took it back to the shop they told me they can't help me, they need to book the phone for repairs and I will have to pay for that. That confused me a lot coz how am I supposed to pay if they're the ones who blocked my phone because it was working fine before I took an upgrade. I came back the second time and they told me the same thing and told me repairs are done at their headquarters. What shock me the second time around was the store attandant offering to buy my phone for R800 rands. I took the matter to the head office in Buccleu and I received another shock when they told me they can't help me because my phone shows no network block on their system. I got more confused now when their technical department refused to diagnose my phone and returned it with a lie that I refused quotation. The promised me to take it up with the cell in Galleria and to contact me with an update. Even today I'm still waiting and I can't use my phone. What an inconvenience and poor service delivery. If this is how they treat their customers who are always on time with contract payments, it is too good for me, I can't deal.