Regret owning Cell C sim for years

If there was a minus starts i would give them that. they are beyond regret. After so man-y years of owning an number, Im in the UK and my line was deactivated as i landed. I contacted them, and they are sending me back & forth emails for 2 weeks now. At this sad Covid-19 time, I am not able to call or receive calls from my family in South Africa, I cant even buy stuff online with my bank because they send me an sms on my blocked cell c to authorize an online payment. Mind you, The walk-in shops are closed!! I have explained the disaster they put me in and they are asking me to call them on this blocked line and they take days to reply. Worst ever!!