23.1 Any notice required to be given under this agreement shall be communicated by written notice sent to the other party. The same applies to the waiver of the provision of any term of the contract. Verbal contracts, changes or additions are not valid. Additional sales contracts conducted via phone that are related to or connected to the existing contract shall be confirmed by the parties in writing via mail or any other suitable form and shall not be binding otherwise.
23.2 A notice delivered by hand shall be deemed to have been received when delivered (or if delivery is not in business hours, at 9 am on the first business day following delivery). A correctly addressed notice sent by pre-paid first-class post or recorded delivery post shall be deemed to have been received at the time at which it would have been delivered in the normal course of post. A notice sent by fax shall be deemed to have been received at the time of transmission (as shown by the timed printout obtained by the sender).