Caution, additional costs are not always shown!

Caution, additional costs are not always shown!
I had booked a holiday home on the Mecklenburg Lake District through HRS holidays for 786.59, the landlord provided the invoice with 967.59. HRS has not shown the additional costs and according to the terms and conditions, the booking price includes all additional costs and deposit, which was not the case, so the holiday was 181 more expensive than expected! Contact with HRS by e-mail not possible, no answer, no help could be given by phone.
Therefore I cannot recommend HRS