Paid Account

I had a personal loan with capitec which I settled in Fe 2013 , march 2014 I received a call from creditors for collection from Capitec of R4000 and I explained to them that its impossible because my Loan was settled, I contacted Capitec and spoke to Adelaide Stevens and send proof of settlement , then I haven't heard from her or creditors again. May 2015 I received a call from different creditors I repeated myself and send the doc's and never heard from them again. Today I received a call from another creditors demanding the same amount of money I explained and send proof. ALL I NOW NEED TO KNOW HOW MANY TIME DO I NEED TO EXPLAIN AND SEND PROOF OF PAYMENTS BEFORE MY NAME GET CLEAR? And when they refer us to the branch to get settlement letters and you settle why do they still require payments? isn't the amount on the settle all that you owe them?