Debt Review Completed - LETTER ????

I am very disappointed in the service I have received from Credix Debt Management, I finished my 5 years of Debt Review in approximately August 2023 and am still waiting for a letter stating that I have paid everything up. I have requested them to send me a letter a number of times since August 2023 - I am desperately in need of buying a new car as mine is on its last legs but I cannot get joy unless I get a letter from them. I have now also all of a sudden started getting calls from Edgars to say that I now owe them again.. HOW IS THIS HAPPENNING???? why do people think its ok to stuff around with someone else's finances.. I don't know where else to go for action.. Please help..