Hi George
Commercial canvassing is a different ball game from domestic knocking(I did it for 5years with a blue chip company)
Treat it as a game follow the rules:-
1)your mission ,should you choose to accept it,is only to find out whose in charge of the decision making on your first call
2) to do this ,you have to get past the 'Gate-Keeper' or as Al Murray would say-secretary
3)she will try and bar your passage to her boss like a linebacker in an NFL game even resorting to man handling you should the need arise
4) disarmer attempts with your charm and merely ask for a compliment slip with the bosses name and(if your really charming)she may know who does it at present and when they might be renewing the contract-this compliment slip is your golden ticket to the end game!!
5) now you know the who,the why and the when -record all this info in a rolling diary
6)2 months before they even think about the contract again,you being super efficient data logger ,will know that its time to send your introductory letter to mr Bigwig introducing your company and don't forget to add that you will call him in a few days to discuss the matter further
7) back to gate keeper!! After a few days,ring the company and ask to speak to Mr Bigwig and say to GateKeeper that he is expecting your call and can you put me through please(as blunt as that) She will be used to being ordered around (sorry girls,just how it is!!) and will transfer your call immediately
8)Discuss terms ,sign new contract -pub for beer and back slapping
9)All of the above is of course subject to complete and abject failure but if that happens,go back to point 1
Commissions taken for commercial contracts now being taken

I'm here all week,try the veal
Thank you
Roy