Statements don't correspond to quotes

Good day. We got fibre installed in May and my husband received the statement recently. I cannot understand the amounts. On the statement itself, there is an amount of R100.88 dated 13th May 2020. What is this for? Secondly, the amount, if adding the cellphone contract and fibre, does not correspond to the quote received for fibre. The agreed price on the fibre was supposed to be ±R604.00 p/m. Also Interim access to the router was supposed to be free of charge. On the statement, it is clear we had to pay for the Interim access router. Also, the amounts for the fibre itself do not add up to R604.00. Why is the fibre split into 2 lines? Why is the pricing on your quotes different to that of statements? I require answers asap.