Norman Bissett & Associates Group Not Responding and getting no Feedback &Communication

if had a choice i wouldn't even be giving them a star😡, my Wonga Account was handed over to Norman Bissett & Associates Group and they've been constantly sending Tons of emails requesting me to make payment arrangements&settle my account from last year and everytime i would respond to their emals requesting an update regarding the status of my account they'll respond almost instantly, now that I've finally paid my account &have been emailing them i get No response at All,I've sent numerous emails informing them that my account's been paid up with proof of Payment and I've gotten Zero responce from them,I've even tried to contact Nimble Pay Group which is a Payment Platform i used to pay my account as per our Payment arrangement but they're also not responding and I'm very Frustrated because now that 'ive paid up&settled my account i feel Ghosted and i really need the Paid up letter urgently since I'm currently on the process of removing my name from Debt Review and its required as proof&confirmation that my account's been paid up, I would really Appreciate it if they could contact me because they're making this whole process take even longer.