Horrible Network Provider Does not care about customer safety.

My Life and Mental Health is in danger Because of MTN worst provider. I took out a new contract MTN gave me a recycled Number of a Gangster or something. People are calling me looking for the previous owner Threatening me and harassing me ,Debt collectors looking for the previous owner. People calling using ugly language. As it is a new contract I ask MTN to change the Number on the Sim. MTN now say I must pay R250 for new number Im already paying for the contract. This number is linked to this guys WhatsApp and He is still using it. I'm sending this phone back how can MTN not take responsibility and change the number for free. Instead I must live with being called and threatened. MTN takes no responsibility for the safety risk this can cause me. My own safety is now at risk because of MTN