Q: i was told my salah is rejectged becuase i bought my car on interst. i make tawba. do i start prating after my car is paid of? (email)

A: Continue to make tawba for the interest transaction you have taken part in.

A person that is sinning would have the quality of his salah lowered if s/she is adamant as to the wrong they have done or are doing. If you accept that you have done wrong and asked Allah (SWT) for pardon, then inshallAllah, He shall forgive you.

Continue performing your salah. We do not see any need for Allah (SWT) to reject your salah.

Allah Certainly Knows Best.