Lack of effective service and now legal threats

I have been a loyal Edgars customer for the past 40 years. I have clothed my 5 children, decorated my home bought gifts for friends and family over all this time. My account has always been paid. Before the Covid Pandemic I was out of work and decided to emigrate. I made arrangements with all my service suppliers to close accounts and gave it no further thought. In May I was told that my account is in arrears due to active financial products. I have set further emails 4 of which have been blocked??why? The call center number -*** - is incorrect/does not exist. call center staff are unable to assist me. Apparently now I owe in excess of R300.00 and I have been threatened with blacklisting.