Matrix and SCS are *****S

I have settled my Matrix account with their legal collections team SCS Management and yet Matrix is still debiting my account, @SCS Management services refuses to send me my settlement letter and yet account was paid off on the 25th of June, on the 19th of May I sent through a cancellation request and yet my account hasn't been cancelled, on the 28th of May another debit order went off, I called Matrix to understand why this happened and they said since I cancelled on the 19th of May this was my last debit order, but still no cancellation confirmation was sent, on the 28th of June 2021 another debit order has gone through and Matrix is telling me that this is correct yet they cannot produce a cancellation confirmation, i've spoken to Rose, Clayton(who was very rude) couldn't even produce a paid up letter to prove that I settled the account. Matrix now again is lying to me saying they sent a cancellation letter but nothing was received, if I cancelled on the 19th of May sure the last debit order should've been on the 28th of May? now a month and 9 days later i'm still being debited by Matrix