We can get an infinite amount of Taka from the machine.

Let $n_k$ denote the amount of money we have after $k$ exchanges with the machine. If we give the machine $x_k$ Taka s.t. $x_k>7$ in the $k$'th exchange, then the machine will return $2(x_k-7)=2x_k-14$ Taka. So, \[n_k=n_{k-1}-x_k+2x_k-14=n_{k-1}+x_k-14\]

So, if $x_k\geq 15$, then $n_k\geq n_{k-1}+1$.

We have $2023$ Taka in the beginning, so we can clearly give the machine 15 Taka in every move. So the total amount of money always increases by at least $1$.

$\therefore$ We can get an infinite amount of money.