account not reactivated after payment of arrears

In December 2014 I paid my arrears account up to date. I acknowledged this by sending an email with the proof of payment to MTN Customer Care. I also explained that I cannot phone customer care from my landline at work as it is connected to an internal software programme which does not allow me to dial numbers like 083 1 808 and because my sim was suspended I couldn't phone from my cellphone. i asked them to give me a call so we can reactivate my line. i followed up my query weekly and only got response 10days after. they queried my account and i told them the dates and amounts of all my payments after which i got a response on 10 Feb 2015 from a Dillon Clayton that my line is reactivated Ref no. ***. i tested the line and found it is still not reactivated. since then i sent emails every third day and do date still didn't get a response. the last email of acknowledgement from mtn was 18/02/2015 confirming that they received my emails. nothing further has been done in order to resolve my problem. this has been ongoing since December 2015.