Penalties in Apartment Purchase

I bought an apartment, according to the contract I was supposed to pay based on the seller's mortgage intent letter, which was supposed to be paid by 27.10. For 11 days of delay, I have to pay 300 shekels for each day. Regarding the intent letter, the seller asked me when to send it (according to the contract, it was supposed to be provided by 20.10). I told him I would update him. In fact, he sent it earlier, on 4.10, so it was valid only until 4.11. I couldn't pay on time due to the appraisal not being ready. The bank could pay only on 6.11, but the intent letter was no longer valid, and until a new intent letter was issued, and due to the holidays that fell on those days, the money was transferred only after 16 days of delay. Now the seller demands compensation: a. Late payment fee for each day, b. Interest on his mortgage due to the delay. The question is whether I have to pay him after I could have paid the money within ten days of delay if the intent letter had been valid.

Shalom and blessings 

The answer of the Dayanim of the Beit Hora'ah:

According to what is described in the question, the seller is correct in his claim. 

However, of course, it is necessary to discuss this in the presence of both parties and hear all considerations. 

Have an additional question on this topic or need clarification? Leave your comment below. (Please note that the comment will not be published but will be sent directly to the answering Rabbi for review and a private response)