Absolutely lack of customer service!

2 weeks ago I went in store in East London to upgrade. I could not do this because Cell C put a note on my account although it is paid up. I phoned them and told them I can not use the online website or app because of a technical error on their side. Sent them an email on 3 February asking for feedback and also to advise them that I missed the special that ended on 31 January because of their mistake. Still no feedback from them and still can not log onto their website or app. So frustrating that the only have customer service from Monday to Friday 08h00 - 17h00. No after hours support, nothing. When you phone them you get put through to various people without someone actually taking charge. Oh ja, and upgrades telephonically can only be done between 08h00 and 11h00. Poor poor poor service. I am thinking of rather ending my contract of years with them and go to their opposition instead of upgrading. Why must one person struggle so much and beg for feedback? Unbelievable!!!