Summoned by 2 attorneys

I have an outstanding debt owed to FNB that I have been paying regularly as per the agreement I have with Blake and assoc. On 18/11/2015 I received a text msg that my acc is handed over to Hammond Pole Att, whom I called to confirm my confusion, I spoke to a Sandile Masilila who informed me that a Karabo would get in touch with me. 1/12/2015 is when Karabo called me (a lady with attitude), she confirmed that according to FNB no payment on my acc has ever been received.3/12/2015 I then spoke to a Pinky Seabi from litigation dept at FNB Bank City who wasn't really helpful. I requested from her that I need something in writing from them confirming my above mentioned, whereby her reply was negative, by which I informed her that I will not be paying on my acc until this is sorted as Blake & Assoc are situated in Pietermaritzburg and they have been receiving my payments.To date no correspondence have been received from FNB regarding my concern. 20/01/2016 I received a text msg from Hammond Pole attorneys stating a summons has been issued (bearing in mind that I had no agreement with them).