Cell C pathetic service, faulty devices and incorrect biling

Please do yourselves a favour and stay away from Cell C. I have had endless trouble with them and from the call centres to cell c insurance to C cell shops I still have not been helped. I upgraded to a new Samsung S10 plus which keeps freezing, my screen goes black, nothing will open and they refuse to help me except that my phone needs to be sent in for 21 working days. Keep in mind this is a business phone and I am expected to be without a phone for 3 weeks because they do not give loan phones. On top if this I have been over billed for 2 months in a row of them still charging me for my old phones insurance. I never have signal, calls drop when clients phone me and I get passed from one call centre to another and this is still not resolved for 2 months now. The service is pathetic and complete day light *******! To top this I received terrible service from East Rand Malls C cell in store manager who shrugged his shoulders and told me he can't help me