Payment via ECS is also allowed. 20,000 Limit is not per month but in aggregate. Citing relevant provisions for better understanding. To be on safe side you can have a loan agreement with nil interest and PAN
[I doubt lender will be willing to give his ITR or bank statement more so when he is helping you]
Important thing is that you should be in position to prove that this money does not belongs to you and is a loan , which should be satisfied on production of loan agreement and PAN of lender
269SS. No person shall take or accept from any other person (herein referred to as the depositor), any loan or deposit or any specified sum, otherwise than by an account payee cheque or account payee bank draft or use of electronic clearing system through a bank account, if,—
(a) the amount of such loan or deposit or specified sum or the aggregate amount of such loan, deposit and specified sum; or
(b) on the date of taking or accepting such loan or deposit or specified sum, any loan or deposit or specified sum taken or accepted earlier by such person from the depositor is remaining unpaid (whether repayment has fallen due or not), the amount or the aggregate amount remaining unpaid; or
(c) the amount or the aggregate amount referred to in clause (a) together with the amount or the aggregate amount referred to in clause (b),
is twenty thousand rupees or more:
269T. No branch of a banking company or a co-operative bank and no other company or co-operative society and no firm or other person shall repay any loan or deposit made with it or any specified advance received by it otherwise than by an account payee cheque or account payee bank draft drawn in the name of the person who has made the loan or deposit or paid the specified advance, or by use of electronic clearing system through a bank account if—
(a) the amount of the loan or deposit or specified advance together with the interest, if any, payable thereon, or
(b) the aggregate amount of the loans or deposits held by such person with the branch of the banking company or co-operative bank or, as the case may be, the other company or co-operative society or the firm, or other person either in his own name or jointly with any other person on the date of such repayment together with the interest, if any, payable on such loans or deposits, or
(c).......
is twenty thousand rupees or more: