Firstly send a legal notice to the company (tenant) mentioning the due amount and the consequences of non-payment of the same.
Mention about the ultimatum of period for the payment or the license agreement shall be terminated and after the termination the company shall be treated as tresspasser in your premises.
You should have no concern with the source of the payment from where your tenant is getting the funds.
Adv. Yogen Kakade
Jurycon Incorporation (Pune)
Advocates & Consultants