The problem of ambiguities in a contract is so old that there must be general principles to resolve them. What are the main such principles, and how are they named (in Latin, English, or French)?
I vaguely remember that who wrote the contract bears the consequences of an ambiguity, to some degree. But I lack a name for that.
Also is there some rule that early clauses beat later ones, unless the later explicitly is an exception to the former?
I'm a party in a French contract, with disputes to be brought to a designated "Tribunal de Commerce", so it matters if the principle is recognized there.
If I can be that specific: the conflict is between a first clause defining how electricity pricing evolves until some specifically laid out condition is met (which is not met), and a later clause allowing change of pricing method by the supplier with a one month notice. Also, clauses governing the termination of contract are asymmetrical, with the supplier explicitly having limited termination rights (basically, fault of the customer), which in my opinion makes unlimited change of pricing method too easy an escape for the supplier.
I could link to the contract (which is public), but it's in French, and I fear this is way off-topic.