To be brutally honest if this is how you conduct your business then i dont see you staying around for long.
Id have been on his case after a week had gone by. The world is full of "del boys" like this. The old "sorry cant do it as my business partner is away" routine is so old im sure the egyptians used it when they did business!
You need to grow a pair and take your business seriously, if you dont then you will end up being everyone's mug.
I am self employed and because of that i have to be extra careful how i get paid.. and more to the point be careful that i actually GET paid at all. Ive seen it all from small business... lost cheque book, accountant away, cant do the payment till next week as its an audit blah blah blah... I give them 7 days then send my standard { pay up or else } letter and if i get no joy after another 3 days im down to the door and making myself known. It works wonders when they know you are NOT a mug and you WONT go away.
Sorry for being harsh but 70 days? are you for real?