Lack of support

Since February 2021 I really had no troubles with Supersonic, but on 27 August 2021 the Huawei router supp**** by Supersonic about 6 months ago has stopped working. After 3 days of futile telephone calls and being transferred numerous times between customer services and technicians, and being on hold for up to an hour at a time, they are refusing to replace the faulty router or to unlock the sim so that I can at least use it in another device. Due to this I am now paying for a sim card that is locked and data that I cannot use. I am at my wits end trying to reason with operators who does not offer a solution but rather transfer me to another section, and those who promised to get information and save it on my query, so that I can get answers today. Well, what shall I say? Empty promises. I have now cancelled my month to month contract with them.