Prescribed debt alicetine

Kindly assist ,I had two accounts with Nimble group a Edgar's and Capitec that was handed over for collections ,I have sent emails to Nimble group that both these accounts has prescribed.,I have recieved a prescription letter from Nimble for the one account (Edgar's account) being prescribed and that the Capitec account will be placed on hold pending further investigation,as per Nimble group no attempts will be made to collect on this account until I have recieved confirmation ,several emails has been sent to them that I'm still receiving SMS' concerning the account that was supposed to be placed on hold even today another sms's being sent ,they have responded that accounts has been closed and that both accounts has prescribed but they still have not sent confirmation letter that the Capitec account has been closed even after requesting it twice .

I also have recieved an encrypted mail from them ,where I'm supposed to enter my ID as a password to be able to sent emails privately to them but even now still no response?.

This company has been harassing me none stop , can you please assist all I have been asking for is the letter concerning the Capitec account being prescribed as per their emails but still no assistance .

I have proof of emails and SMS received from Nimble group .

Your assistance herewith will be appreciated .