Overseas Income Assessment Form ignored?

Hello!

At the end of February I sent the Overseas Income Assessment Form, filled in with all my job details, direct debit details, and attachments required, but I still did not hear back from SFE.

I'm guilty about waiting until then, but I wasn't sure about staying abroad until the very end!

In the most recent letter I received, asking for this form, it's written that a Non compliance interest rate will be applied until I send updated information.
The first payment is due by 10th April.

How long does it usually take to process these documents?
Should I assume my form got lost and send a new one already or should I simply start repaying and see if this thing will eventually get sorted out?


Thank you,
Federico