If a fault occurs in your service, your first port of call should always be to contact the company you purchased the service from, either to make a complaint or to notify them of the fault. Additionally, you are always entitled to contact the company you are paying for the service.
In other words, there is no set period for how quickly or in what way a fault should be rectified; instead, it depends on the circumstances in each individual case. For this reason, it is important that as soon as you become aware of the fault, you report it to the operator, as you cannot claim compensation in the form of a discount, for example, from any earlier than the date of your report. We also recommend that you report the fault in writing and keep a copy of the letter, a printout of the email, or a screenshot of a notification sent via a website form, for example.
If the fault does not affect the usability of the service, you may need to accept that the company will take slightly longer to rectify it. Similarly, you may need to accept a longer wait for a fault to be rectified if the company ensures you are provided with a replacement product.