Unsolved issue

I am struggling to rectify my pending payments, even though the supplier has canceled it on their end. Pick 'n pay told me they voided the payments on side, and I need to check my bank statement. Capitec asked me for a letter but Pick n Pay don't answer me regarding the letter requested from Capitec. Just send me a proof that they voided the transactions. Its still shows pending on my bank account. I am from Pick 'n Pay to Capitec but cant get this resolved. Who is who's client?