Billing

I am very disappointed in home connect for increasing the bill without informing me, they say communication was sent out in April, I went through all my mails for April nothing, I have check for an SMS nothing 😞. I have signed a 12 months contract with them for R528 pm which has increased now, but If you cancel within the 12 months you will be liable for cancelation cost, does this makes sense, I will not be proceed with them when my 12 months is done. Very disappointing😡