No refund from Avbob after they destroyed new tombstone

I have been with Avbob since 2014 and when my mother in law passed away in May this year we asked them to do a re-opening of the grave so that we can bury her on her husband's grave as per her wishes.

The grave to be opened had a newly installed tombstone and Avbob assured us that it will be removed for burial and put back on after, they have done this for other clients before.. we were told they won't damage the tombstone.

On the day of the burial we were shocked to discover that the new tombstone was broken and shattered to pieces as if a hammer was used to remove it. We notified Avbob about this and they promised to fix the tombstone but they didn't.

Since my mother-in-law was buried in May we informed Avbob that we need to unveil the tombstone in August so we need them to fix the new tombstone they destroyed for the unveiling.

Avbob then put together the broken pieces of the smashed tombstone with cement to reconstruct it and painted over it. When we saw this shocking reconstructed patchwork they did we were highly disappointed to say the least cause we realized that they still had no intentions of making things right.

August came and passed still Avbob was playing hide and seek till we had no other choice but to buy a new tombstone for the unveiling which was postponed to September.

Avbob promised to refund us for the damage but to this day they remain silent. We have sent several emails to the branch and even to their head office but we are being ignored.

We took a loan to purchase the tombstone that Avbob destroyed and we are still paying for it but Avbob takes no accountability for the damage they caused.

Please help