NO FEEDBACK AND REFUSAL TO CLOSE PAID UP ACCOUNT

On Friday 6 July 2018 i settled one of my accounts, immediately sent the proof of payment and requested a "Closure and Paid Up Letter"...to this ****** day i have had nothing. I phoned your call centre yesterday and was promised i will get an sms as well as the matter was sent to your admin to update and do same, almost 7 days nothing from you. yet you are too quick to call none stop when 1 payment is missed. please close this immediately and cancel the debit order you have loaded as i do not owe you on this loan. the worst service towards your customers and trust me it was the 1st and certainly the last. JUST ****** CLOSE THIS ACCOUNT AND SEND ME THE PAID UP LETTER...IS THAT HARD TO ASK????