Fibre upgrade

I have been a loyal customer to Afrihost for years and have 2 accounts and 1 mobile service with them. I have 2x 50mb down and 50mb up fibre lines with them and dont want to move over to webafrica for lower pricing on faster internet speeds i just want my 50mb line upgraded to 100mb download and 50mb download for the same price I am paying now as webafrica is even cheaper than that when I wanted to cancel my line previously they quickly wanted to give me higher speeds for the same price but now they dont want to