i received an email thanking me for paying back my loans which i have not when i went in to the site and logged in it was going to let me reloan which im not going too

I have now had an email saying that it will be their last one than it will be going to their solicitors i have tried all week to got the person who was dealing with it but all i get is that person is not in the office what do i do now

i got a wonga loan last year but did not pay back on agreed date since then i have arranged to pay them 43.75 fortnightly but now cannot afford to pay that i have already canceled my bank card do i now contact the lady who is dealing with it to try and see if i can make the payments smaller or wait until the pass it to a dca please help