Electronic and Postal Communications (Tariffs) G.N. No. 421 (contd) (d) state the reasons why the tariff should be investigated. (3) Where, after investigation the Authority is of the view that the tariffs is to be adjusted, it may adjust the tariffs. (4) Where the Authority intends to adjust the tariffs after investigation, the Authority shall notify the licensee and give the licensee twenty one days to respond to the intended adjustment. Promotion and special offers Cap. 41. 12.-(1) The Authority may from time to time issue Rules on promotions and special offers. (2) A licensee shall file all details of the promotion or special offer with the Authority at least two working days before the date of the implementation of a promotion or special offer. (3) A licensee shall ensure that all promotion and special offers(a) Provide the terms and conditions and the details of the manner of participation. (b) provide clear information to its customers on the terms and conditions of the promotion or special offer, through publication in widely circulated local news papers in English and Kiswahili and where applicable, in accessible electronic media, sign language or any other method acceptable by the Authority; (c) indicate and publish where the special offer or promotion requires the customer to pay a the applicable rate; (d) obtain the necessary approval from the Gaming Board of Tanzania, established under the Gaming Act, where the special offer or promotion involves games of chance, and inform its consumers accordingly; (e) anti-competitive. (4) A licensee shall submit to the Authority a statement of compliance to sub-regulation (3). 89