Cellc customer service

Good day I bought a laptop with a contract in February 2018 in cellc germiston store.The laptop was not functioning and I took it back the same day, they told me to reset my Microsoft pin and try login before I bring it back, I did that and still it wouldn't allow my pin, I took it back the following day and they told me they'll take it back to repairs and call me within seven working days. I waited for two weeks until I went to the store since there was no phone call from them but they told me they'll call me again when it is back and as usual there was no communication that I received from them.After a month I went there only to find they've lost my charger and the laptop was not even taken to repairs. Because I was angry they took it to repairs and told me that they will call me.There was no phone call as usual so I went there and found that my laptop was returned from repairs with no charger since they booked a charger from that side,they don't know whether it is fixed or not and I was told that they'll call me until today. I am paying this laptop for the third time but I don't have it with me.I decided to take the matter to the customer helpline and I was transferred to the repairs centre and they told me there's nothing they can do I should talk to the stores people,now those people are not helping me and I am really frustrated paying for something that I don't have. I hope to get help from you