Quick credit - My personal contact synced and contacted

I had taken loan from an app called Quick credit. I have used it few times. This time my salary was not created and hence it took me a month to repay them but I had informed them and was also trying to manage the amount any how but failed. Day before yesterday I informed them I'll pay them on **st with every single penny of fine and interest they have applied. But what they did instead is synced my contact and sent a embarrassing message about me to every one in my contact saying that I have given there number as reference. The message has been sent to every one in my contact. though I have paid them the due. I'm not sure if I'd be able to go to office now . That too for a sum of what **** rupees? Please help me out. I'm not sure what should be done in this type of scenario.