I'd be careful and have them clarify what they are saying - if they are saying issues 77 and 99 they may not mean volume 77

I received issue 99/volume 99 in February after a bit of a wait. One of the few cases where the issue and volume number are the same - there's got to be a less confusing way for them to do these partworks right!).

To complete my collection, I'm missing

#71 Vol 77 Disolution
#73 Vol 56 City on Fire
#75 Vol 70 Punishment