1. We shall effect payment to the debit of your account if the relevant cover … received.
(1. has not been, 2. was not been, 3. have not been)
2. The repetition … as collation.
(1. has known, 2. is known, 3. know)
3. We did not execute payment as the beneficiary … the town.
(1. leaves, 2. has left, 3. left)